948 ZOOLOGY MOLLUSCA. 



FAM. VALVATIDAE. 



Genus VALVATA, O. F. Miiller. 

 VALVATA SINCERA, Say. 



Valvata sinccra, SAY, Long's Exped. Rocky Mts., 1823,264, pi. xv, f. 11. SAY, Coucb., 

 Binuey's ed., 130, pi. Ixxiv, f. 11. HALD., Mon., 0, pi. i, figs. 5-10. ADAMS, 

 Verm. Moll., 152. Id., Am. Jour. Sci. & Arts (1), xl, 267. DBKAY, N. 

 Y. Moll., 110, pi. vi, figs. 127, 128. BINNEY, Laud & Fresh Water Shells 

 N. Y., pt, iii, 1805, 12. 



Valvata dfpm*, pars KUSTEK, in Chemnitz, ed. 2, 1852, 88. MENKE, Zeit. fiir Mai., ii, 

 1845, 122 (including tricarinata and simplex). 



Valvata striata, LEWIS, Proc. Acad. Nat. Sci. Phila., 1850, 200. 



Found in same locality as some individuals of the genus Tryonia, and 

 is apparently rare in Utah, although found in the northwest rather abund- 

 antly. 



Mr. Tryon has furnished the following three names of species occur- 

 ring in our collections; but, as there is some doubt on .this point, we have 

 preferred to mark them doubtful : 



FAM. VIVIPARIDAE. 



Genus CAMPELOMA, Raf, 

 ?CAMPELOMA INTEGRA, Say. 

 Detroit River ; Madeline Island ; Lake Superior. 



FAM. RISSOIM. 



Genus TRYONIA, Stimpson. 

 ?TEYONIA EX1GUA, Conrad. 



With regard to this species, Mr. Tryon writes me that a representative 

 of the genus Tryonia was found in the same locality as Carinifcx neivberryi, 

 viz, shores of Sovicr Lake, Middle Utah. Mr. Tryon informs me this is 

 probably T. exigua, Stimp., or else a now species. Unfortunately, not 

 enough specimens were secured to establish the latter. He considers this 

 discovery a valuable one. 



