. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. 154 TERRESTRIAL AIR-BREATHING MOLLUSKS. PATULA, Hald. Fig. Animal of Falula soiitaria. Animal heliciform; body elonf^atcd, semi-cylindrical, tapering to a point posteriorly, convex above, plane beneath; mantle simple, central, not extend- ing beyond, and accurately fitting to the peristome of the shell, into which the whole animal may retire ; head obtuse ; eyes at the end of long, cylindrical, retractile peduncles; tentacles short, retractile; generative orifice on the side of the head, behind the right
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. 154 TERRESTRIAL AIR-BREATHING MOLLUSKS. PATULA, Hald. Fig. Animal of Falula soiitaria. Animal heliciform; body elonf^atcd, semi-cylindrical, tapering to a point posteriorly, convex above, plane beneath; mantle simple, central, not extend- ing beyond, and accurately fitting to the peristome of the shell, into which the whole animal may retire ; head obtuse ; eyes at the end of long, cylindrical, retractile peduncles; tentacles short, retractile; generative orifice on the side of the head, behind the right eye-peduncle; respiratory orifice in the collar, at the angle of the aperture of the shell, anal orifice mimediately adjoining; no caudal mucus pore, no locomotive disk. Shell widely umbilicated, depressed, discoidal, turbinate, rugose, or costu- lately striate; whorls 4-6, equal or gradually increasing; aperture lunately rounded; peristome simple, straight, acute. As there appears considerable confusion in regard to the limits of the genus, I think it best to make no reference to any species foreign to North America. Here it ranges over both the Central and Eastern Provinces. In none of the American species of this genus have I found a jaw with dis- tinct well-formed ribs as in Helix. In several species, however, such as strigosa Fig. 60. Fig. 61. Jaw of Patula asteriscus (Morse). Patula striatella (Morse). and Cooperi, there are distinct traces of subobsolete ribs near the cutting mar- gin, and still more so in incrustata. In asteriscus there are coarse wrinkles, resembling subobsolete ribs. In perspectiva, striatella^ and Idahoensis there are such wrinkles, and also coarse vertical striae. I have not found the striae as oblique as shown in Fig. 61. In soiitaria, allernala, and Hemphilli there are no traces of either ribs, wrinkles, or stria?. In all these species there is a tendency to a median projection to the cutting edge. This is greatly developed in soii- taria, altern
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