. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. Figure 23. Two lateral views (left valve), one an enlargement of holotype of Silicula pafagonica Dall. ( Nat. Mus. No. 96914, Station 2783, west coast of Patagonia.) which initially curves dorsally in front of the umbo rather than being straight, and an ^ 3 ooc 00. I -| —I— L ENGTH (mm) 1 Figure 24. Size/frequency distribution of specimens of S. mcalesferi collected from Station 280, and sorted ac- cording to sex and gonadigl development, anterior hinge that is shorter and more ve
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. Figure 23. Two lateral views (left valve), one an enlargement of holotype of Silicula pafagonica Dall. ( Nat. Mus. No. 96914, Station 2783, west coast of Patagonia.) which initially curves dorsally in front of the umbo rather than being straight, and an ^ 3 ooc 00. I -| —I— L ENGTH (mm) 1 Figure 24. Size/frequency distribution of specimens of S. mcalesferi collected from Station 280, and sorted ac- cording to sex and gonadigl development, anterior hinge that is shorter and more ven- trally curved which bears shorter though thicker teeth (Figs. 25, 27). The soft parts are very simih\r to S. fila- tovae, with differences being a matter of degree. The adductor muscles are relatively large, ovoid, and equal in size. The long axis of the anterior adductor muscle is dorsoventral, that of the posterior approxi- mately anteroposterior. The exhalent siphon is well developed with a slight but notice- able siphonal embayment. The inhalent aperture, as in all species of the genus, is formed by the apposition of the inner mus- cular mantle layers, but involves no fusion. A single tentacle on the right side is inserted between the inhalent aperture and the ex- halent siphon. The gill is horizontal with 35-40 gill filaments to each side of the axis of each demibranch, the outer filaments be- ing half the size of the inner. The palps, with approximately 18 ridges, are relatively. 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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