136 OTHER SNAILS. 



some Buckeye trees, which grew on the hillsides, just 

 east of Bolinas. 



There are several varieties, some of which are 

 smaller than the cut. One of these varieties is usually 

 classed as a distinct species, under the name of 

 Arionta exarata, Pfr., ex-a-ra'-ta. It has a yellow- 

 ish, roughened shell, about an inch in diameter, and 

 is circled by a very distinct, dark chestnut band. 

 The umbilicus is large and distinct, and the peristome 

 is white. It is found in San Mateo and Marin coun- 

 ties, California. 



Helix {Arionta) tudiculata, Binney, tu-dik-u-la'-ta. 

 Shell large, rather thin, marked by numerous small 

 indentations; umbilicus nearly or completely closed, 

 peristome white, thickened near the umbilicus. The 

 six whorls are of an olive brown color, and a rather 

 wide band with a lighter space above and below it 

 encircles the body whorl. Diameter from an inch to 

 an inch and a quarter. This is a southern species, 

 being found about San Diego, also ranging northward 

 through Tulare and adjacent counties to the Sierras. 

 Helix {Arionta) Tozvnsendiana, Lea, Towns-end-i- 

 a'-na, Fig. 125. 



This distinct species is a 

 northerner, being found chiefly 

 in Oregon and Washington 

 Territory. The specimen from 

 which the engraving was drawn 

 was collected near Kalama, 

 Fig. 125. Washington. 



Shell strong, five and one-half whorled, spire but lit- 

 tle elevated, color yellowish or brownish, sometimes 

 mottled; peristome turned outward and resembling a 

 white horseshoe; umbilicus large and distinct. The 



