8 PALUDINA SUBCARINATA. 



from a Schuylkill shell, of which a represents the opercle. 

 Fig. 3 is from a Massachusetts specimen. Fig. 4 is from 

 a reversed Ohio specimen in the cabinet of Mr. Lea. 

 Figs. 5 and 6 represent the young of different ages. 



PALUDINA SUBCARINATA, Say. 



PLATE 2. 



P. testa elongata, tenui, apice acutissima, (interdum 

 erosa,) pallide fusco-virente: anfractibus quinis vel senis, 

 valde convexis, transversim striata: sutura valde impressa: 

 apertura ovata, postice rotundata. 



SYNONYMS AND REFERENCES. 



P. SUBCARINATA, SAY. Nich. Encyc., (Amer. ed.) art. 



Conch., pi. i. fig. 7. 

 P. CARINATA, VALEN. Rec. d'Obs. de Zool., par Humb. 



et Bonpl. 



DESCRIPTION. 



ANIMAL with the foot translucent, the sides 

 parallel, the front truncated, and the posterior 

 extremity obtusely rounded. The general co- 

 lour is dark grey, dotted with light orange. 



SHELL conoid, elongated, thin and translu- 



