. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 208 TERRESTRIAL AIR-BREATHING MOLLUSKS. slightly curving ; tentacles prominent and conical, pellucid at tips. Respira- tory foramen visible in the external angle of aperture. This is a well-defined species, always known by its subconical shape and tri- angular aperture, nearly filled up by the coarse, projecting, columellar tooth. The description here given applies to the most common form of the mature shell, as ascertained from the examination of more than one hundred speci- mens from different localities. Among a nu
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 208 TERRESTRIAL AIR-BREATHING MOLLUSKS. slightly curving ; tentacles prominent and conical, pellucid at tips. Respira- tory foramen visible in the external angle of aperture. This is a well-defined species, always known by its subconical shape and tri- angular aperture, nearly filled up by the coarse, projecting, columellar tooth. The description here given applies to the most common form of the mature shell, as ascertained from the examination of more than one hundred speci- mens from different localities. Among a number of specimens there will of course be different degrees of development and consequent variation from the normal form. Specimens from particular localities seem always to be more delicate, and never to attain that coarseness of parts in the aperture which is common. There is sometimes a slight thickening of the left peristome near its extremity. Mature specimens vary considerably in size. The aperture is beautifully white within. Genitalia, jaw, and dentition unknown. Pupa rupicola, Say. ' Vol. III. PI. LXX. Fig. 1. Shell cylindrical, elongated; epidermis brownish horn-color; whorls 6, con- vex, the three anterior ones of nearly equal diameter, the three posterior dimin- ishing very slightly, and forming an obtuse apex ; suture deep; peristome brownish, thickened within, widely reflected ; aperture lateral, semicircular, truncated above by the body-whorl; teeth 5, one on the middle of the colu- mella prominent, compressed, emarginate in the middle, and often bicuspid ; Fig. 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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