Diam. 0.20 pol. Alt. 0.07 pol.
Hab. “Santa Barbara Island.”
Shell depressed, discoidal, pale corneous, under the lens minutely striated, opaque, broadly and perspectively umbilicated; whorls 4, the last shelving but not descending (at the aperture); suture linear; aperture rounded, lunate, lip simple, the external and internal approximating.
This pretty little planorboid Helix bears a striking resemblance to Planorbis albus Müller, (hirsutus Gould,) especially in its upper aspect. Beneath, the whorls are less distinctly shown than in the Planorbis. I take pleasure in dedicating this species to Professor Henry Durant, of the College of California.
In addition to the above, the State Collection contains the following species of Californian Helices:
Helix arrosa Gould, sps. 858, common near mouth of S. F. Bay. Also a yellow variety from Santa Cruz, Mr. Rowell.
Helix Californiensis Lea, (?) sps. 969, or a var. of H. nickliniana Lea? J. G. Cooper.
Helix Carpenteri Newc., sps. 1136, a broken dead shell, from the head of San Joaquin Valley, Mr. Gabb.
Helix Columbiana Lea, sps. 901, near San Francisco.
Helix chersina Say, sps. 1125, found near Lake Taho; very large. J. G. C.