Perkins.] 126 [October 6, 



Moll. N. Y., p. Ill, pi. vi, fig. 119. Turbo vinctus Montagu, Test. 

 Brit. 



Not very common. The fuscous variety is rare. 



PALUDDram 



Melantho Bowditch, 1822. 



Melantho decisa Binney, Shells of N. A., part 3, p. 41, figs. 

 79-84. Paludina decisa Say, Am. Conch., p. 49, pi. x ; Hald., Monog., 

 p. 4, pi. i; Gould, Invert. Mass., p. 22, fig. 144. iVivipara decisa Gill, 

 Proc. Phil. Acad.) 



Common in all ponds and streams, but small and usually much 

 eroded. 



VALVATID.E. 



Valvata Gray, 1840. 



Valvata tricarinata Adams, Am. Journ. Sci., Vol. XL, p. 267; 

 Gould, Invert. Mass., p. 125, fig. 156; De Kay, Moll. N. Y. T p. 118, 

 pi. vi, fig. 130; Binney, Shells of N. A., pt. in, p. 9, fig. 13. Valvata 

 unicarinata De Kay, Moll. N. Y., p. 118, pi. vi, fig. 129. 



Common in all ponds and streams. 



Valvata sincera Say, Am. Conch., p. 130, pl.lxxiv, fig. 11, 1824; 

 Hald., Monog., p. 6, pi. i, figs. 5-10; De Kay, Moll. N. Y., p. 119, 

 pi. vi, figs. 127, 128; Binney, Shells of N. A., pt. in, p. 12, fig. 17. 



This species is quite rare. I have found it only in Harris's pond, a 

 mile and a half west of New Haven. The animal is dark ; tentacles 

 slender, sharply pointed, white, with a dark line through the middle; 

 eyes on the inner bases; rostrum short, round at the end; foot oblong, 

 narrow, rounded behind, bilobed before. 



CERITHIAD^. 



, Bittium Leach, 1847. 



Bittium nigrum Stimps., Check List. Pasithea nigra Totten, 

 Am. Journ. Sci., Vol. xxvi, p. 369, pi. i, fig. 7. Cerithium reticula- 

 tum Totten, Am. Journ. Sci., Vol. xxvm, p. 352. Ceritliium Sayii 

 Gould, Invert. Mass., p. 278, fig. 183; De Kay, Moll. N. Y., p. 128, 

 pi. viii, fig. 167. 



