. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. digestive diverticula ant. add. mus. ant. sense organ 'byssal' gland palp 1 mm Figure 9. Unnamed species of Spinula. Semidiagrammatic view of right side of the animal to show disposition of the organs. even concentric ridges; rostrum short, sharply pointed; umbos sHghtly anterior in position, in larger specimens small with low profile, beaks medially curve; dorsal margin moderately convex; antero- dorsal margin sloping sharply to form smooth curve with anterior margin; pos- tero-dorsal margin nearly straight be- tween
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. digestive diverticula ant. add. mus. ant. sense organ 'byssal' gland palp 1 mm Figure 9. Unnamed species of Spinula. Semidiagrammatic view of right side of the animal to show disposition of the organs. even concentric ridges; rostrum short, sharply pointed; umbos sHghtly anterior in position, in larger specimens small with low profile, beaks medially curve; dorsal margin moderately convex; antero- dorsal margin sloping sharply to form smooth curve with anterior margin; pos- tero-dorsal margin nearly straight be- tween umbo and distal edge of hinge plate, thereafter angling abruptly to form a short, usually sharp, pointed rostrum demarked from ventral margin by a con- cave sinuosity; ventral margin long, smoothly curved, convex, with greatest convexity in larger shells adjacent to pos- terior sinus (, maximum shell height posterior to umbo); keel present, extend- ing from umbo to point of rostrum, weak- ly developed near rostrum, becoming strong anteriorly where concentric lines fomi a sharp angle; hinge broad, strong and relatively long; anterior hinge plate. Figure 10. Unnamed species of Spinula. Lateral views of the three specimens recorded from our samples, to show variation in the shell 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
Size: 1509px × 1656px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorharvarduniversity, bookcentury1900, booksubjectzoology
