Shell discoidal, pale corneous, shining, transparent, suture slightly channelled, broadly umbilicate; whorls 5; aperture lunate; lip thin, simple. This shell may be compared with _H. arborea_ Say, from which it differs by its less elevation, more polished and lighter colored surface, and more open umbilicus. Eight specimens found; one from Northern California, by Prof. Brewer. _Helix Duranti_ Newc. State Collection, Species 987. H. testa depressa, discoidea, pallide-cornea sub-lente minutissime striata, opaca, late et perspective umbilicata; anfr. 4. ultimus declivis non descendens; sutura linearis; apertura rotundata-lunaris; peristomate simplici, approximato. 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. _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 infumata_ 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 Valley, Mr. Gabb; north to Mount Shasta, Prof. Brewer.