14 HELICID^. 



STXOXYMS AND KEFERENCES. 



B. Oregontnsis, Lea, Trans. Amer. Philos. Soc. ^^. 100, read Jul}', 1837 ; 

 Pfeiffek, Monog. Helic. 11. 339. 



Obs. oh Genus Unio, etc. II. 100, pi. 23, f. S5. 



The above description is confessedly defective, as the 

 specimens described were inunatm-e ; but they were evi- 

 dently, on comparison, the young of the folloiving, the 

 description of -which fully represents the species. The 

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

 Dupetithouarsii, Desh. 



Testa umbilicata, orbicvilato-convexa, laevigata vel substriata, 

 satm-at^ castanea, supern^ pallidior, nigrescenti-rufo cingulata : 

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

 inflatus ; apertura ovato-semilunaris, iutus alba, fasciata ; peris- 

 toma simplex, brevissim6 refiexum, margine columellari arcuato, 

 supeme dUatato-reflexo, umbilicum mediocrem non ocfiiltaute. 



STKOSTMS AKD KEFERENCES. 



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

 GcEBiN, Mag. 1841, tab. 30. 

 CHE3IN., 2d ed. 319, tab. 56, f. 3-5. 

 Pfeiffeb, Jlonog. Helic. I. 338. 



DiAM. maj. 29, nun. 25 ; alt. 17 mill. 

 Inhabits California and Oregon. 



HELIX AREOLATA, SOWEEBT. 



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

 fiiscis interruptis vari^ ornata ; spira depresso-conoidea ; anfractus 



