166 HELICID^. 



therefore the right of priority, and is universally adopted 

 in this country, as it should be elsewhere. F^russac 

 quotes Rafinesque for the specific name in this case, as 

 well as in some others ; but it is not known when or 

 where his descriptions were published. 



In a former account of this species, I considered it to 

 be identical with H. Vancouver ends, Lea, for reasons 

 then given. Good authorities have differed from me in 

 opinion ; and in deference to them, but without entire 

 conviction on my part, I now treat them as distinct. A 

 more particular notice of their differences and resem- 

 blances is given in the remarks on that species, which 

 immediately follows. 



31. HELIX VANCOUVERENSIS, Lea. 



Plate XX. 



H. testa planulata, late uinbilicata, luteolo-viridescente ; 

 anfractibus quinis, ad basim rotundatis ; apertura transversa 

 sub-circulari, superne depressa ; labro subtus sub-refiexo, 

 supra simplici ; columella brevi, callosa. 



SYNONYMS AND BEFEKENCES. 



Helix Yancouverensis, Lea, Am. Phil. Trans. VI. 87, pi. 23, f. 72. 



De Kay, Nat. Hist. New Y^rk, p. 45. 



Pfelffeb, Symbolse, II. 41. 



Monog. Helic. Viv. I. 200. 

 Helix concava, Binney, Bost. Joura. Nat. Hist. III. 372, pi. 14. 



DESCRIPTION. 



Animal short posteriorly, sub-cylindrical, very light 

 colored, giving a straw-colored reflection, sides pearly, 



