. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. Deep Sea Protobranchs • Allen and Sanders 27. 5 hilleri '^\ S filotovae Figure 27. Spinula subexcisa. Series of shell outlines in lateral view to show change in shape with increasing size. lantic—a single record from the Gulf of Aden (Knudsen, 1967). Thus, may occur along the lower slope of the eastern mid and South Atlantic and ex- tend around the Cape of Good Hope into the western Indian Ocean. Yet, the re- markable differences in the depth rec- ords for this species in the Atlantic (1261, 1376, 1624-179
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. Deep Sea Protobranchs • Allen and Sanders 27. 5 hilleri '^\ S filotovae Figure 27. Spinula subexcisa. Series of shell outlines in lateral view to show change in shape with increasing size. lantic—a single record from the Gulf of Aden (Knudsen, 1967). Thus, may occur along the lower slope of the eastern mid and South Atlantic and ex- tend around the Cape of Good Hope into the western Indian Ocean. Yet, the re- markable differences in the depth rec- ords for this species in the Atlantic (1261, 1376, 1624-1796, and 1739 m) as com- pared to the Indian Ocean and Gulf of Aden (2312, 3152-3202, 3546, 4300- 4340, and 4314-4324 m), together with the absence of any detailed knowledge of the soft part anatomy for the Indian Ocean specimens, raise the possibilit\' that we may unwittingly be lumping to- gether two morphologically similar species. appears to be absent from the western Atlantic. MORPHOLOGICAL CONSIDERATIONS Both the shell and soft parts of species in the genus Spinula are amazingly con- servative. Of the species recorded from the Atlantic, specific shell differences are a matter of subtle variations in shape and dimension. At one extreme there is a bi- valve with a robust broad hinge with. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Harvard University. Museum of Comparative Zoology. Cambridge, Mass. : The Museum
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