144 I'HE MANY-WHORLED SNAILS. 



wrinkles and lines. Color dark gray, with various 

 bands of chestnut, crossed by threads of yellow. 

 The diameter and height are about equal, an inch 

 or more. As is well known, these creatures are highly 

 esteemed in France and other countries of Europe by 

 lovers of good things. The time may come when 

 they will be abundantly raised in California for the 

 same purpose. 



Gonostoma Yatesi^ Cooper, Go-nos'-to-ma Yates^-i, 

 is a little species found in Calaveras county, Califor- 

 nia. The shell is ver}' peculiar from the fact that the 

 spire, instead of being elevated as in most shells, is 

 considerably depressed. The whorls are wound round 

 and round one another in a horizontal plane, and as 

 the shell-tube grows larger and larger it leaves a hol- 

 low both above and below. Whorls seven, aperture 

 crescent shaped, color yellowish brown, diameter one- 

 fourth of an inch. 



Polygyrella polygyreUa, Bland, Pol-y-gy-reF-la, is 

 the singular name of a little snail, having a many- 

 whorled spire but slightly elevated, an aperture 

 guarded by a white tooth on the inner wall, and an 

 umbilicus large and open. A curious feature of this 

 shell is that one or more sets of little white teeth may 

 be seen inside the body-whorl through the transpar- 

 ent, horn-colored shell. Its diameter is less than half 

 an inch. It is found in Idaho, on the Cceur d'Alene 

 ]\Iountains, especially in spruce forests. 



Polygyra Harfordiana^ Cooper, Pol-y-gy'-ra Har- 

 ford-i-a^-na, has an umbi Heated, flattened shell of four 

 whorls, with an aperture guarded by three teeth, one 

 on the inner w^all and two on the white, reflected per- 

 istome. The shell is horn-colored. It is found on 

 high elevations in Fresno county, California. 



