172 HELICID^. 



from beyond the Rocky Mountains, corresponding in 

 type to species of the Atlantic slope. It is closely 

 allied to E. jxilliata, but is smaller, more convex, and 

 lacks the columellar tooth. It is still somewhat doubtful 

 if it be really distinct from S. columbiana, which may 

 possibly have been described from small, denuded speci- 

 mens ; but I cannot, with a magnifier, discover on Mr. 

 Lea's specimens, the papilhie on which hairs might have 

 been situated, and which are so readily seen in this spe- 

 cies. The lip is also considerably broader, and pecu- 

 harly flexuous. — [g.] 



34. HELIX MOBILIANA, LEA. 



Plate XLII. Figure 2. 



H. testa parva, sub-globosa, arete perforata, rufo-carnea, 

 glabra ; spira depressa, anfractibus senis convexis ; apertura 

 rotundata, lunata; labro reflexiusculo ; basi convexa. 



SYNONYMS AND EEFERENCES. 



Helix moiiliana, Lea, Proc. Araer. Philos. Soc. II. S2, anno 1841. 

 Trans. Am. Philos. Soc. N. S. IX. 17. 

 Pfeitfer, Monog. Helic. Viv. I. 323. 



DESCRIPTION. 



Animal not observed. 



Shell sub-globose ; epidermis corneous, nearly 

 smooth ; spire rather prominent ; suture impressed ; 

 whorls rather more than five, the last ample ; striae of 

 increase hardly visible ; lip white, very narrow, re- 

 flected, a deep groove behind it ; aperture well rounded, 



