VALVATA TRICARINATA. 



cause of this must be the carelessness of col- 

 lectors in distant regions, in passing over ob- 

 jects of small size; as it is not probable that 

 the genus is as confined in its distribution as 

 the localities of the described species might 

 lead us to suppose. 



VALVATA TRICARINATA, Say. 



PLATE 1. FIG. 



V. testa viridi, turbinata; spiral bicarinata, depressa; 

 anfractibus 3, ultimo tricarinato. 



SYNONYMS AND REFERENCES. 



CYCLOSTOMA TRICARINATA, SAY. Nich. Encyc. (Am. 



ed.) art. Conch. Journ. Acad. Nat. Sci., vol. i. p. 13. 



Anno 1817. Subsequently VALVATA. 

 VALVATA CARINATA, SOWEKBY. Genera of Shells. 

 V. TRICARINATA, SAY. DESH. Lam., vol. viii. p. 507. 

 V. TRICARINATA, SAY. GOULD. Invert, of Massachusetts, 



p. 225, fig. 156. 

 ADAMS. Thompson's Hist, of Vermont, App., p. 2. 



