ACADEMY OF NATURAL SCIENCES. 119 



opaca, late et perspective umbilicata ; anfr. 4. ultimus declivis non descendens ; 

 sutura linearis ; apertura rotundata-lunaris ; peristomate simplici, approximate 



Diam. 0.20 pol. Alt. 0.07 pol. 



Hab. " Santa Barbara Island." 



Shell depressed, discoidal, pale corneous, under the lens minutely striated, 

 opake, 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 Muller, (hirsutus Gould,) especially in its upper aspect. Beneath, the 

 whorls are less distinctly shown than in the Planorbis. I take pleasure in dedi- 

 cating this species to Professor Henry Durant, of the College of California. 



In addition to the above, the State Collection contains the fol- 

 lowing 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. 



Helix Dupetithouarsi Desh. sps. 492, from Point Cypress, Monterey. J. G. C. 



Helix exarata Pfeiffer, sps. 920. Mt. Diablo, Prof. Brewer ; Santa Cruz, 

 Mr. Rowell. 



Helix fidelis Gray, sps. 1135, Humboldt Bay, and mountains near lat. 42°. 

 Prof. Brewer. A black variety ; Dr. Frick . 



Helix infurnata Gould, sps. 880, near Ballenas Bay, Mr. Rowell. 



Helix Kellettii Forbes, sps. 856, San Diego, and Catalina Island ; the latter a 

 very fine variety. J. G. Cooper. 



Helix loricata Gould, sps. 880, near Oakland, Dr. Newcomb. 



Helix Newberryana W. G. Binney, sps. 881, Temescal mountains, near Los 

 Angeles, Prof. Brewer. 



Helix Nickliniana Lea, sps. 912, near S. F. Bay ; common. J. G. C. 



Helix sportella Gould, sps. 899, near San Francisco. J. G. C. 



Helix mormonum Pfeiffer ; San Joaquin Yalley, Mr. Gabb ; north to Mount 

 Shasta, Prof. Brewer. 



Helix Traskii Newc, sps. 863, from mountains near Santa Barbara, Prof. 

 Brewer. May be a variety of H. Dupetithouarsi. 



Helix tudiculata Binney, sps. 768, near San Diego and San Pedro. J. G. C. 



Helix Vancouverensis Lea, sps. 1093, Straits of Fuca, Mr. Gabb. Perhaps 

 extends south to Humboldt Bay. 



