Catai^ogue Recenixy De;scribe;d Moi^lusca 139 



Hydrobia seemani Fraiienfeld, Verb, der k. k. zool.-bot. Gesell. Wien, 1863, 



■ p. 1025 ; Ibid, 1865, p. 525, pi. VIII. 

 Bythinella seemani Pilsbry, N. Am. Fauna, No. 7, Pt. II, 1893, p. 278. 



For an elaborate and fully illustrated account of tbe variation of this 

 protean species, see Stearns' paper cited above. 



Pai^udestrina sai,sa Pilsbry. 



Paludestrina salsa Pilsbry, Naut., XIX, 1905, p. 90, pi. Ill, fig. 10. 

 Type locality: Cohasset, Mass., in brackish water. 



Paludestrina stearnsiana Pilsbry. 



Paludestrina stearnsiana Pilsbry, Naut., XII, 1899, p. 124. 



Type locality: Oakland, Cal. Also Marin, Tuolumne, Contra Costa and 

 Santa Cruz Counties, Cal. Also Ash Canyon and Tanner Canyon, 

 Huachuca Mts., Ariz., Pilsbry and Ferriss (io6a, p. 516). 



Genus TRYONIA Stimpson, 1865. 



Pilsbry (96, p. 122), states that Tryonia is probably only a subgenus of 

 Paludestrina. 



Tryonia ci^athrata Stimpson. 



This species, described from fossil specimens, has been found living in 

 the Pahranagat Valley, Nev. (Stearns, 123, p. 281). 



Genus PYRGULOPSIS Call and Pilsbry, i^ 



Pyrgulopsis Call and Pilsbry. Pr. Davenport A. N. S., V, 1886, p. 9. 

 Type : Pyrgula nevadensis Stearns. 



Pyrgulopsis lktsoni (Walker). 



Amnicola letsoni Walker, Naut., XIV, p. 113 (1901) ; Letson, Bull. Eufl'alo 



Soc. Nat. Sci., VII, 1901, p. 241, fig. 165. 

 Type locahty : Post-Glacial deposit. Goat Island, Niagara River, N. Y. Also 



fossil at Bowmanville, Ills, and living at La Plaisance Bay, Lake Erie, 



Monroe Co., Mich. 

 Goodrich {in lit.) has suggested that this species should be referred to 

 Pyrgulopsis and I fully agree with him. 



Pyrgulopsis nevadensis (Stearns). 



Pyrgida nevadensis Stescrns, Pr. A. N. S. P., 1883, p. 173, text fig.; Call and 

 Beecher, Am. Nat., XVIII, 1884, pp. 851-855; Call and Pilsbry, Pr. 

 Davenport Acad. Nat. Sci., V, 1886, p. 10, pi. II, figs. i-io. 



Type locality : Walker and Pyramid Lakes, Nev. 



