GASTEROPODA. 215 



Isthmia ventricosa Morse, Ann. Lye. Nat. Hist. N. Y., 1865, vol. 8, 

 p. 207, figs. 1-3. "Maine; Concord, N. H.; Mohawk and 

 Greenwich, N. Y." 



Me. — Woodland; Westbrook; Bethel; Ironbound Id. 

 N. H. — Concord (Morse). 

 Conn. — New Haven. 



Vertigo ventricosa elatior Sterki. 



Sterki, Land and Fresh Water Moll. New Philadelphia, Ohio, 

 1894, p. 5. [Ohio.] 



Me. — Ironbound Id. (Blaney); Woodland; North Warren. 



* Vertigo ovata Say. 



Say, Joum. Acad. Nat. Sci. Phila., 1822, ser. 1, vol. 2, p. 37.5. 

 " Pennsylvania." Gould, Inv. Mass., 1870, p. 442, fig. 704. 



Me. — Portland. 



N. H.^ — Portsmouth. 



Vt.— Middlebury; Hartland. 



Mass. — Boston; Lynn; Cohasset; Westport; Duxbury. 



R. I.— Tiverton. 



Conn. — Stonington; Deep River; New Haven. 



Vertigo tridentata Wolf. 



Wolf, Amer. Joum. Conch., 1870, vol. 5, p. 198, pi. 17, fig. 1. 

 " Canton, Illinois." Walker, Rept. Geol. Surv. Mich., 1906, 

 p. 518, fig. 153. 



Me. 



Vertigo (Vertilla) milium (Gould). 



Dall, Harriman Alaska Exped., 1905, vol. 13, p. 33, fig. 24. 

 Pupa milium Gould, Boston Joum. Nat. Hist., 1840, vol. 3, 

 p. 402, pi. 3, fig. 23. " Chelsea, [Mass.]." 



