PULMONATA VITE1NIDAE VITEINA LIMP1DA. 



933 



Rocky Mountains to Pacific Ocean. Twin Lakes, Colorado, is the most 

 easterly locality now known. 



VITRINA LIMPIDA, Gould. 



Vitrina pellucida, DEKAY, N. Y. Moll., 1843, 25, pi. iii, f. 42 (nee Miiller). ADAMS, 

 Verm. Moll., 1842, 1G2. BINNEY, Terr. Moll., ii, 58, pi. Ixvii, a, f. 1. 



Vitrina americana, PFEIFFER, 1852, Proc. Zool. Soc., Dec., 156. CHEMNITZ, ed. 2, 

 1854, 9, pi. i, figs, 22-25. 



Vitrina limpida, GOULD, in Agassiz's Lake Superior, 1850, 243 ; Terr. Moll., 1. c. 

 PFEIFFER, Malac. Blatt, 1856, ii, 10. Id., Mon. Hel. Viv., iv, 798. W. G. 

 BINNEY, Terr. Moll., 33. REEVE, Con. Icon., 62. MORSE, Jonr. Port. Soc., 

 i, 1864, p. ii, pi. v, f. 17. Id., in Am. Nat., i, 18G7, 314, f. 20. TRYON, Am. 

 Jour. Conch., ii, 1866, 243, pi. iii, f. 1. 



Found in Northeastern States and. northwest of Lake Superior, by the 

 expedition in Colorado. 



Genus ZONITEa, Montf. 

 Subgenus Hyalina (Fe"r.) Gray. 

 ZONITES ARBOREUS, Say. 



This and the succeeding species are widely distributed, being found 

 throughout Eastern North America, and in fact all over the northern por- 

 tion of the continent where the mountains have ceased to be barriers to 

 distribution. 



