. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 290 BuUetin Museum of Comparative Zoology, Vol. 145, No. 6 Shell small, less than mm in length; smooth, almost transparent, fragile and with fine concentric striae; height measurement about times length (Fig. 34); oblong and rounded in outHne; dorsal margin of intermediate length, gently rounded, curv- ing gradually ventrally from the umbonal region and forming raised crests both be- hind and before the umbo; posterior crest longer than the anterior; posterior margin broad and smoothly rounded with the ven- tr
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 290 BuUetin Museum of Comparative Zoology, Vol. 145, No. 6 Shell small, less than mm in length; smooth, almost transparent, fragile and with fine concentric striae; height measurement about times length (Fig. 34); oblong and rounded in outHne; dorsal margin of intermediate length, gently rounded, curv- ing gradually ventrally from the umbonal region and forming raised crests both be- hind and before the umbo; posterior crest longer than the anterior; posterior margin broad and smoothly rounded with the ven- troposterior margin longer than the dorso- posterior; anterior margin narrow and sharply, though evenly, rounded; ventral edge smoothly rounded; umbos small, low. relatively elongate, medially directed with, characteristically, a more opac^ue medial and ventral region (Fig. 2S); umbos central (50%) of the distance along dorsal margin in smaller specimens, but more anterior (45%) in larger individuals (Figs. 29, 34); shell with small gape at the posterior end of dorsal margin (Fig. 31). Hinge plate long, narrow, weak, with a short section under the umbo straight and parallel to the dorsal margin; anterior and posterior to the umbo the hinge line slopes slightly ventrally; ligament internal, large, amphidetic, at least twice as deep dorso- ventrally as long, somewhat bean-shaped in. Figure 29. Lateral views of a series of specimens of Lamefila abyssorum to show changes in shape with increasing 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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