LA BRILL ANTE. 131 



of six distinct and rounded whorls. Its shape is cyl- 

 indrical, the apex is rounded, the aperture small, with 

 little teeth on the walls far inside the opening. Yel- 

 lowish horn-colored; length, one-eight of an inch. 



Pupa corpulent a, Morse, cor-pu-len'-ta, is a minute 

 species, having a shell of four whorls, and an aper- 

 ture set with four teeth. Length, one- tenth of an 

 inch. From Washoe county, Nevada, also from Utah 

 and Colorado. 



Pupa muscorum, Linn., mus-co'-rum, is a circum- 

 polar species, and is found in Nevada and Colorado. 

 Whorls six or seven, rounded; aperture small; color 

 dark chestnut; length about one-eighth of an inch. 



Ferussacia subcylindrica, Linn., Fer-rus-sa'-si-a 

 sub-sil-in'-dri-ca, Fig. 121. 



The little creature to which this shell 



I A belongs lives chiefly in forests, concealing 



-j-fjt itself under leaves and the bark of dead 



^ trees. The shell is about the size and shape 



Pi g I2I of a grain of wheat, thin, dark horn-colored, 



very bright and glistening. There are five or six 



rounded whorls and a rather small, elliptical aperture. 



The specimen from which this figure was drawn 



came from Weber canon, but the same species exists 



in the east, and also in Europe. Owing to the great 



luster of the shell, it is known in France as u la 



brillante." 



The generic name for most of our land snails is 

 Helix, He'-lix. They live in all countries, and the 

 number of species is very great indeed. In 

 general we may say that the Helix has a spiral shell 

 and a soft body, which it can withdraw into the shell 

 when it wishes to be concealed. The eyes are fixed 

 upon long stalks, the tongue is set with minute, flinty 



