14 HELICIDJS. 



SYNONYMS AND REFERENCES. 



//. Oref/onensis, LEA, Trans. Amer. Philos. Soc. VI. 100, read July, 1837 : 

 PFEIFFER, Monog. Helic. II. 339. 



Obs. on Genus Unio, etc. II. 100, pi. 23, f. 85. 



THE above description is confessedly defective, as the 

 specimens described were immature ; but they were evi- 

 dently, on comparison, the young of the following, the 

 description of which fully represents the species. The 

 two should therefore be united, with the prior name, H. 

 Dupetithouarsii, Desh. 



Testa umbilicata, orbiculato-convexa, laevigata vel substriata, 

 saturate castanea, superne pallidior, nigrescenti-rufo cingulata ; 

 spira conoideo-obtusa ; anfr. 7-8 angusti, convexiusculi, ultimus 

 in flatus ; apertura ovato-semilunaris, intus alba, fasciata ; peris- 

 toma simplex, brevissirn^ reflexum, margine columellari arcuato, 

 superue dilatato-reflexo, umbilicum mediocrem non occultante. 



SYNONYMS AND REFERENCES. 



Helix Dupetithouarsii, DESHAYES, Revue Zool. 1839, p. 360. 

 GUERIN, Mng. 1841, tab. 30. 

 CHEMN., 2cl ed. 319, tab. 56, f. 3-5. 

 PFEIFFER, Monog. Helic. I. 338. 



DIAM. maj. 29, min. 25 ; alt, 17 mill. 

 Inhabits California and Oregon. 



HELIX AREOLATA, SOWERBY. 



T. perforata, orbiculato-conoidea, striata, nitidula, alba, lineis 

 fuscis interruptis vari ornata ; spira depresso-conoidea ; anfractus 



