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Some observations on Pelagosphaera larvae (Sipunculoidea)
OCEANOGRAPHIC ABSTRACTS
This section contains a group of abstracts of current papers on general oceanography and related subjects. Together with the oceanographic bibliography it will provide a comprehensive service to scientists engaged in deep-sea research and oceanography in general. For ease of reference the names of authors are arranged in alphabetical order. Ar~Do, K., 1963. Some studies on the typhoon. (In Japanese, English subtitles). Bull. Kobe
Mar. Obs., 171 (Art. 10): 23-29.
Characteristics of the movements of the double typhoons, the change of contours at 500 mb and the location where the interaction between double typhoons may be strengthened, are discussed. The relations of the typhoon development with contours and winds at 500 mb and the contour o f 28°C sea surface water temperature and the distribution of the frequency of the typhoon development were also considered. AKESSON, B., 1961.
Some observations on Pelagosphaera larvae (Sipunculoidea).
Galathea
Rep. 5: 7-17. The morphology a n d histology of four specimens are described in detail. The morphology is compared to that of other recorded Pelagosphaera larvae whose systematic position is discussed. It is suggested that the glandular organ which opens in the oral disc and the ventral sensory organ of Siphonosoma, Phascolososoma and Aspidiphon are homologous. The metatroch cilia forms both a floating and a food-collecting apparatus.
AMANIEU)M., 1963. Evolution des populations de Paragnathia formica (Hesse) au cours d'un cycle annuel. Bull. Inst. Ocean., Monaco, 60 (1261): 12 pp. This is a n historical account o f our knowledge on Paragnathia formica (Hesse) from Monod's work (1926) to that of Claire StoWs (1962). The conditions for its life-cycle in Arcachon are described. Grounded animals were collected each m o n t h from t h e ' schorre ' micro-cliffs of t h e ' Ile aux Oiseaux,' from January 1961 to December 1962. The specimens were classified into seven different types : males, females I, females II, females III, male and female half-growns, pranizes 3. From tables the author emphasizes the following : 1. Uninterrupted occurrence of males, contrary to seasonal outburst of other types, mostly females and half-grown individuals. 2. Continual metamorphosis o f males notwithstanding some seasonal variations. 3. Time of year of shore-grounding of pranizes reaching the end of their larval life. 4. Time of year of female metamorphosis. 5. Length of gestation. 6. Time of hatching. Finally the author suggests an outline of the chronological evolution of a Paragnathia formica (Hesse) population. The methods applied for these investigations give a good correlation between the outline above and the animals' life-cycle in nature. ARSENYEV,V. S. and A. D. SHCHERBININ,1963. Investigation of currents in the Aleutian waters and in the Bering Sea. (In Russian). Mezhd. Geofiz. Komitt., Prezid., Akad. Nauk, SSSR, Rezult, Issled. Prog. Mezhd. Geofiz. Goda, OkeanoL lssled., (8): 58-66. F r o m charts of currents in the Bering Sea and in the Aleutian region during the summer season; it is concluded that : 1. The Alaska current, originating in the bay of the same name, is stable a n d flows westwards along the southern side of the Commandorski Alaska ridge to the Kamchatka shores. 2. Near the Blizhny islands it mixes with the waters of northern branch of the Kuroshio. 3. As it flows westward, the Alaska current branches into the Bering Sea, to form an anticyclonal circulation around the four bigger island groups. These vortex systems in the southern part of the Bering Sea, and counter-currents in the straits, are complex. 4. In the main cyclonal current system of Bering Sea, water is transported from west to east north of the Aleutian Islands, but not as a continuous flow, as does the Alaska current. It consists of a system of currents around the islands and of vortices in the southern part. This system seems to influence the water exchange between the Bering Sea and the Pacific. 27
This section contains a group of abstracts of current papers on general oceanography and related subjects. Together with the oceanographic bibliography it will provide a comprehensive service to scientists engaged in deep-sea research and oceanography in general. For ease of reference the names of authors are arranged in alphabetical order. Ar~Do, K., 1963. Some studies on the typhoon. (In Japanese, English subtitles). Bull. Kobe
Mar. Obs., 171 (Art. 10): 23-29.
Characteristics of the movements of the double typhoons, the change of contours at 500 mb and the location where the interaction between double typhoons may be strengthened, are discussed. The relations of the typhoon development with contours and winds at 500 mb and the contour o f 28°C sea surface water temperature and the distribution of the frequency of the typhoon development were also considered. AKESSON, B., 1961.
Some observations on Pelagosphaera larvae (Sipunculoidea).
Galathea
Rep. 5: 7-17. The morphology a n d histology of four specimens are described in detail. The morphology is compared to that of other recorded Pelagosphaera larvae whose systematic position is discussed. It is suggested that the glandular organ which opens in the oral disc and the ventral sensory organ of Siphonosoma, Phascolososoma and Aspidiphon are homologous. The metatroch cilia forms both a floating and a food-collecting apparatus.
AMANIEU)M., 1963. Evolution des populations de Paragnathia formica (Hesse) au cours d'un cycle annuel. Bull. Inst. Ocean., Monaco, 60 (1261): 12 pp. This is a n historical account o f our knowledge on Paragnathia formica (Hesse) from Monod's work (1926) to that of Claire StoWs (1962). The conditions for its life-cycle in Arcachon are described. Grounded animals were collected each m o n t h from t h e ' schorre ' micro-cliffs of t h e ' Ile aux Oiseaux,' from January 1961 to December 1962. The specimens were classified into seven different types : males, females I, females II, females III, male and female half-growns, pranizes 3. From tables the author emphasizes the following : 1. Uninterrupted occurrence of males, contrary to seasonal outburst of other types, mostly females and half-grown individuals. 2. Continual metamorphosis o f males notwithstanding some seasonal variations. 3. Time of year of shore-grounding of pranizes reaching the end of their larval life. 4. Time of year of female metamorphosis. 5. Length of gestation. 6. Time of hatching. Finally the author suggests an outline of the chronological evolution of a Paragnathia formica (Hesse) population. The methods applied for these investigations give a good correlation between the outline above and the animals' life-cycle in nature. ARSENYEV,V. S. and A. D. SHCHERBININ,1963. Investigation of currents in the Aleutian waters and in the Bering Sea. (In Russian). Mezhd. Geofiz. Komitt., Prezid., Akad. Nauk, SSSR, Rezult, Issled. Prog. Mezhd. Geofiz. Goda, OkeanoL lssled., (8): 58-66. F r o m charts of currents in the Bering Sea and in the Aleutian region during the summer season; it is concluded that : 1. The Alaska current, originating in the bay of the same name, is stable a n d flows westwards along the southern side of the Commandorski Alaska ridge to the Kamchatka shores. 2. Near the Blizhny islands it mixes with the waters of northern branch of the Kuroshio. 3. As it flows westward, the Alaska current branches into the Bering Sea, to form an anticyclonal circulation around the four bigger island groups. These vortex systems in the southern part of the Bering Sea, and counter-currents in the straits, are complex. 4. In the main cyclonal current system of Bering Sea, water is transported from west to east north of the Aleutian Islands, but not as a continuous flow, as does the Alaska current. It consists of a system of currents around the islands and of vortices in the southern part. This system seems to influence the water exchange between the Bering Sea and the Pacific. 27