. Bulletin of the Natural History Museum Zoology. DEEP-SEA PROTOBRANCHIA (BIVALVIA) 81 Fig. 133 Portlandia abyssorum. Lateral views of three shells from the right side to show variation in shape. Dorsal view of a shell and detail of the hinge-plate of a left valve. Specimens taken from a, Sta. 24, Galathea Expedition, Sierra Leone Basin (Type specimen); b, c & d, Sta. 85281, Cape Verde Basin; e, Sta. 85216, Cape Verde Basin. (Scales = mm). Portlandia abyssorum (Knudsen 1970) Type locality. Galathea, Sta. 24, E., Atlantic off W. Africa, 1950, 3°54'N, 8°22'W, Trawl, 3196
. Bulletin of the Natural History Museum Zoology. DEEP-SEA PROTOBRANCHIA (BIVALVIA) 81 Fig. 133 Portlandia abyssorum. Lateral views of three shells from the right side to show variation in shape. Dorsal view of a shell and detail of the hinge-plate of a left valve. Specimens taken from a, Sta. 24, Galathea Expedition, Sierra Leone Basin (Type specimen); b, c & d, Sta. 85281, Cape Verde Basin; e, Sta. 85216, Cape Verde Basin. (Scales = mm). Portlandia abyssorum (Knudsen 1970) Type locality. Galathea, Sta. 24, E., Atlantic off W. Africa, 1950, 3°54'N, 8°22'W, Trawl, 3196 m. Type specimen. Holotype: Zoological Museum, University of Copenhagen. Yoldiella abyssorum Knudsen 1970, 47, Fig. 29, pi. 1, Fig. 17. Cruise Sta DepthNo Lat Long Gear Date (m) CAPE VERDE BASIN Discovery 85216 3070- 6+2v 20°'N 18°'W WS 26. 3064 85281 3155-72+2v 17°'N 18°'W WS 3150 - 17°'N 18°'W Atlantis II 148 31114-1 10°'N 18°'W ES 31 3828 149 3861 3 10°'N 18°'W ES 7. ANGOLA BASIN Atlantis II 195 3797 45 14°'S 9°'E ES 19. 42 196 4612- 4630 1 10°'S - 10°'S 9°'E 9°'E ES 21. CAPE BASIN Jean Charcot DS05 4560 1 33°'S 2°'E DS (Walvis) CP13 3550 1 32°'S 13°'E CP 12. Occurs at abyssal depths off the west coast of Africa, Cape Verde, Angola & Cape Basins. Depth range: 3064-4630 mm. Shell description (Figs. 133 & 134). An accurate descrip- tion is given by Knudsen (1970). Populations of this species vary somewhat in the shape of the shell outline from that of the type specimen to specimens with a more straight or slightly concave postero-dorsal margin and a more convex postero-ventral margin with intermediates between these two extremes. Internal morphology (Fig. 135). In contrast to the description of Knudsen (1970) there is an inhalent as well as an exhalent siphon. The short ventral inhalent siphon is not particularly obvious
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