ISLAND SNAILS. 1 33 



banded, while the upper half of each whorl is usually 

 darker than the corresponding lower half. The animal 

 is said to be black. The shell is about one inch in 

 diameter. This species lives chiefly on Santa Barbara 

 Island, off the coast of southern California. 



Helix {Ariontd) inter cisa, W. G. B., A-ri-on'-ta 

 in-ter-si'-sa, is similar, in both size and shape, to the 

 last species. The aperture is oblique and shaped like 

 a horse-shoe; the umbilicus is small and partly con- 

 cealed by the white, reflected lip. The surface is 

 reticulated, and in some specimens the lines of 

 growth are very conspicuous. The color is white or 

 brown, and sometimes the whorls are obscurely 

 banded. Chiefly from San Clemen te Island, California. 



Helix {Ariontd) Kelletti, Fbs., Kel-lett'-i. Shell 

 consisting of six whorls, spire rather low, umbilicus 

 nearly closed, aperture horse-shoe shaped. Shell 

 smooth, color varying from whitish to brown, usually 

 mottled, with a brown band around the center of the 

 body whorl. Diameter about an inch. From Santa 

 Catalina and San Clemente Islands. 



There are numerous varieties, as casta n at s, minor, 

 and Steamsiana, Gabb. The last one is more 

 globose, and is of an ashy color. It is found chiefly 

 in Lower California, but it exists around San Diego. 

 It is considered by Mr. Binney as a distinct species. 



Helix {Ariontd) Nickliniana, Lea, Nik-lin-i-an'-a. 



This species has a fine, yellowish horn -colored 

 shell, with a distinct band of dark brown. Spire 

 moderately elevated, whorls six in number, lip white 

 within, somewhat reflexed at the base, umbilicus dis- 

 tinct, but not large. The diameter is an inch or less. 

 This species is found near the coast of central Cali- 

 fornia, and by some authorities it is considered as but 



