THE NATURAL HISTORY SURVEY. 249 



KEY TO SPECIES OF VALLONIA. 



A. Shell with fine, oblique striae. 



1. Lip reflected, shell light horn colored pulchella 



B. Shell coarsely costate. 



1. Color reddish horn, last whorl descending a little in front. . .costata 



2. Color reddish, smaller than 1; last whorl not descending. . .parvula 

 99. Vallonia pulchella Muller,* pi. xxviii, fig. 26. 



Helix pulchella MULLER, Verm. Hist., Vol. II, p. 30, 1774. 



Helix Paludo so, DA COSTA, 1780. 



Helix crystallina DILLWYN, 1817. 



Helix minuta SAY, Journ. Phil. Acad., p. 123, 1817. 



Helix pulchella var. l&vigata MOQUIN-TANDON, 1855, a. o. 



Vallonia pulchella var. enniensis GREDL., Tirol's Conchylien, 1856. 



Vallonia pulchella var. persica ROSEN., Nachrichtsbl, D. Mai. Ges., 

 p. 123, 1892. 



Vallonia pulchella var. hispanica, STERKI, Proc. Phil. Acad., p. 251, 

 1893. 



Shell: Small, depressed conic, rather solid, umbilicated; 

 surface shining, marked by numerous fine crowded oblique 



Fig. 77. 



Jaw of VALLONIA PULCHELLA Muller. (Pilsbry, Guide to Helices, pi. 

 79, Fig. 29.) 



striae, which are obsolete on the large, knob-shaped nuclear 

 whorl; color light horn, opaque to transparent; periphery 

 rounded; sutures deeply impressed or even excavated; whorls 

 four, the last two rapidly increasing, rounded, the last whorl 

 little, if any, descending at the aperture; spire plano-convex; 

 aperture very nearly circular, a little oblique; peristome re- 

 flected, white, thickened, the ends approaching; umbilicus 

 open, large, spreading, exhibiting all the volutions; base of 

 shell convex. 



Greater diam., 2.50; lesser, 2.00; height, 1.25; umbilicus, 0.80 mill. (10125.) 

 2.30; " 1.90; 1.10; " .0.80 " (10125.) 



2.60; " 2.10; " 1.30; " 0.80 " (10125.) 



Animal: With a small, short foot, marked on the sides 

 and back by several fine longitudinal lines; tail with a mucus 

 pore; eye-peduncles long and slender, tentacles short and 



*See Sterki, Observations on Vallonia, Proceed. Phi). Acad., 1893, p. 246. 



