HELIX. 



157 



GEOGRAPHICAL DISTRIBUTION. This shell was brought 

 from the Pacific coast by the U. S. Exploring Expedition, 

 and was marked Oregon. 



REMARKS. At first sight this would not be distin- 

 guished from H. monodon. But, besides coming from a 

 different zoological region, it has an imperforate, convex 

 base, like H. hirsuta, instead of the pitted umbilical 

 region which H. monodon has, whether perforated or not ; 

 and the hairs are much more sparsely distributed, being 

 not more than one-fourth as numerous. The basal por- 

 tion is less arcuated, so that the aperture is more trans- 

 versely elongated, and less properly crescentic. [G.] 



27. HELIX MAXILLATA, GOULD. 

 PLATE XL.a. FIGURE 2. 



H. testa parva, globoso-lenticulari, solidula, castanea, H. 

 hirsutce simili ; apertura linear! ; labro reflexo, integro prse- 

 ter emarginationem dente obsolete divisam, fauce lamellam 

 sicut maxillam pone labrum gerente ; lamella columellari 

 recta, superne bifurcata. 



SYNONYMS AND REFERENCES. 



Helix mazillata, GOULD, Proc. Bost. Soc. Nat. Hist. III. 38, July, 1848. 



DESCRIPTION. 



SHELL small, rather solid, of a rounded lenticular 

 form and pale chestnut color, resembling very closely 

 H. hirsuta. Besides being considerably smaller, a close 



