16(j HELICID^E. 



therefore the right of priority, and is universally adopted 

 in this country, as it should be elsewhere. Ferussac 

 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 -ensis, 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, L.EA. 

 PLATE XX. 



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

 anfractibus quinis, ad basim rotundatis ; apertura transversa 

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

 supra simplici ; columella brevi, callosa. 



SYNONYMS AND REFERENCES. 



Helix Vancouverensis, LEA, Am. Phil. Trans. VI. 87, pi. 23, f. 72. 



DE KAY, Nat. Hist. New York, p. 45. 



PFEIFFER, Symbolse, II. 41. 



Monog. Helic. Viv. I. 200. 

 Helix concava, BINNEY, Bost. Journ. Nat. Hist. III. 372, pi. 14. 



DESCRIPTION. 



ANIMAL short posteriorly, sub-cylindrical, very light 

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



