HELIX. 13 



DiAM. If poll. ; axis, f to ^j^ poll. 



Brought from San Francisco by Dr. Bigelow and by 

 Mr. Samuels. 



With the general form and coloring of R. Toumsend- 

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

 has a different aperture, revolving strife, and is destitute 

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

 granulated sui-face. 



HELIX INFUMATA, GoULD. 



Testa magna, discoldea, biconvexa, ad perlpheriam obtusti cari- 

 nata, \siit umbilicata, supra infumata et rugis miuutis obliquis 

 asperata, infra nigerrima, nitida et mimitissim^ gramdata ; anfract. 

 6-i couvexiusculis : apertura rhomboidea ; labro ruib, basi reflex- 

 iusculo; fauce sericca, lilacina, prope labrum fuscescente . 



SYNONYMS AND lUSFEKENCES. 



Bdix infumata, Gould, Proc. Bost. Soc. Nat. Hist. (Feb. 1855,) V. 137. 



DiAM. 1^ ; axis, | poll. 



Brought from San Francisco by Dr. Bigelow. 



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

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

 for H. Niittalliana, but is distinguished by its lenticular 

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

 lated surface. 



HELIX OREGONENSIS, Lea 



Testa subcarinata, tenuis, laivis, rufo-t'usca, ad carinam bifas- 

 ciata, superne subconvexa, infern6 subinfiata. 



