62 PROCEEDINGS OF THE CALIFORNIA 



Fig. 15. 



On a New Genus of Terrestrial Mollusca Inhabiting California. 



BY J. G. COOPER, M.D. 



Binneya Cooper.* 



Generic characters. — General form of auimal like Limax, with a shell re- 

 sembling that of Omalonyx or Lamellaria. 



Body about three times as long as shell, semicylindrical, obtuse in front, form- 

 ing an acute angle behind ; foot extending the whole length, somewhat distinct 

 anteriorly, and carinate behind. Mantle shield-like, covering the back anterior 

 to the shell for about one-fourth its length, not reflected over the shell. Eye- 

 peduncles moderate, slender, two short acute tentacles in front of head. Lingual 

 teeth resembling those of Helix in form and arrangement. 



Shell entirely external, ear-shaped, nearly flat, about one-third as long as the 

 animal, which it does not half cover when retracted. Spire flattened, forming 

 two horizontal volutions, last whorl enormously expanded and slightly arched. 

 Columella distinct, entire, hiding the interior of the convolutions. 



Binneya notabilis Cooper. State Coll. Species 988. 



Speajic characters. — Animal dark lead-colored, with black reticulations, and 

 a wide brown stripe along the median line, extending from the mantle to the 

 front of head, about one-fourth of the total length. 



Shell with a pale brown, smooth and shining epidermis, extending beyond 

 the margin, translucent when youug, becoming thickened by an opaque white 

 deposite on the interior when old. First whorl or nucleus ornamented with 

 about thirty delicate parallel revolving ribs, not concealed by the epidermis, and 

 ending abruptly at the commencement of the transverse lines of growth in the 

 body whorl. 



Length 0.46, breadth 0.34, height 0.12 inch. 



This genus resembles Limax in its shield-like mantle, but in the more essen- 

 tial characters of the lingual teeth, appears to belong undoubtedly to the Heli- 

 ci&a. It approaches nearest to the subfamily Vitrinirue, in having the mantle 

 in front of the shell, approaching nearest to the Daudebardia of Europe ; but 

 differs in the form and opacity of the shell, which resembles some of the Suc- 

 cinince, especially Omalonyx of South America, etc. It differs from these very 



* To all those who have seen the splendid works on the " Terrestrial Mollusks of the 

 United States," by the late Dr. Amos Binney, so ably continued by bis son W. G. 

 Binney, the appropriateness of the name will be at once evident. 



