28 



LAND AND FRESH-WATER SHELLS OF N. A. [PART T. 



Fig. 25. 



Vitrina angel icae. Beck. — Sliell convexly depresseri, smooth, 

 polished, pellucid, greenish-yellow; spire short, subprominent ; suture 

 delicately crennlated ; whirls three and one-half, rapidly 

 increasing, the last broad below ; aperture oblique. Innate- 

 oval ; peristome simple, subintleeted, its columellar margin 

 not receding and slightly arched. Greatest diam. 6, lesser 

 4§ ; height 3^ mill. 



Vitrina angelica, Beck, Ind. 1. — Moller, Ind. Moll. Gr. 

 4 (1842).— Pfeiffek, Mon. Hel. Viv. II, 510.— 

 MiJRCH, Nat. Bidr. v. Gr. 76.— W. G. Binney, T. M. 

 U. S. IV, 32, pi. Ixxix, f. 9.— Reeve, Con. Icon. 45.— Tryon, Am. 

 Journ. Conch. II, 243, pi. ii, f. 2 (1866). 

 Helix pellucida,'F ABBicivs, Fauna Gr. 389, excl. syn. Mitller (1780). 

 Helix domestica, Strom.' Der Tronh. Vidensk. III. 435, pi. vi, f. 15. 



Greenland, 



Vitrina angelica, 

 enlarged. 



Vitrina pfeifferi, Newcomb. — Shell moderately depressed, smooth, 

 shining, pellucid, greenish-white ; whirls three, the last corn- 

 Fig. 26. posing most of the shell ; suture very finely margined ; aperture 

 large, t)bliquely and roundedly ovate ; lip thin, columella 

 arched. Diam. 5, axis 2 mill. {Newcomh.') 



Vitrina pfeifferi, Newcomb, Proc. Cal. Acad. Nat. Sci. II, 92 

 (1861).— Tbyon, Am. Journ. Conch. II, 244, pi. iii, f. 3 

 (1866). 



Carson Yalley, Nevada to Owen's Yallej, California. 



Fossil Species of Yitrina. 

 Vitrina ohliqua, Meek & Hayden, Proc. Phila. Acad. Nat. Sci. 1857, 134. 



' This name I give to a little snail, which is represented by fig. 15, since 

 I find nothing in Linne's Systema Nat. to which I can with certainty refer 

 it. It is small, ovate-rounded, and somewhat convex above, and shows 

 three small and flat whirls on the one side. The aperture is large and 

 may be called almost entirely round, and the columella, or part attached 

 to the snail's house, comprises a small segment, or may be inscribed in an 

 exact circle. The shell is yellowish, and so brittle that one cannot pick it 

 up without breaking it in pieces. It contains a bluish snail. It is found 

 in great numbers under the moss or turf on hou.ses, and is sometimes fully 

 as large as the figure, which represents both the upper and lower sides. 

 (Strom.) 



