HELIX. 1 



Q 



DIAM. If poll. ; axis, f to ^ poll. 



Brought from San Francisco by Dr. Bigelow and by 

 Mr. Samuels. 



With the general form and coloring of H. Townsend- 

 iana it has the aperture of H. tudiculata. The former 

 has a different aperture, revolving striae, and is destitute 

 of a band ; the latter is not umbilicated ; neither have a 

 granulated surface. 



HELIX INFUMATA, GOULD 



Testa ruagna, discoidea, biconvexa, ad peripheriam obtuse cari- 

 nata, late umbilicata, supra infumata et rugis minutis obliquis 

 asperata, infra nigenima, nitida et minutissime granulata; anfract. 

 61 convexiusculis : apertura rhomboidea ; labro rufo, basi reflex- 

 iusculo ; fauce sericea, lilacina, prope labrum fuscescente. 



SYNONYMS AND REFERENCES. 



Helix infumata, GOULD, Proc. Bost. Soc. Nat. Hist. (Feb. 1855,) V. 137. 



DIAM. l ; axis, f poll. 



Brought from San Francisco by Dr. Bigelow. 



It has the form and color of H. plicata, Born, without 

 its complicated aperture. It might, at first, be mistaken 

 for H. Nuttalliana,) but is distinguished by its lenticular 

 form, smoky black color, and its peculiar rasp-like granu- 

 lated surface. 



HELIX OREGONENSIS, LEA. 



Testa subcarinata, tennis, Ircvis, rufb-fusca, ad carinam bifas- 

 ciata, superne subconvexa, interne subiuflata, 



