DISTRIBUTION OF GENERA AND SPECIES 



171 



We notice, in the first place, the South American list. 

 Here Vitrina, Vertigo, and Glandina, all the genera of 

 the Limacidce except Vaginulus, which replaces Tehen- 

 nopliorus, being, like that species, entirely covered with 

 a mantle, are wanting. Succinea holds a smaller nu- 

 merical proportion than in North America. Bulimus 

 predominates in the astonishing proportion of ninety- 

 one in a total of one hundred and thirty-five ; holding 

 about the same rank there, that Helix maintains in the 

 southern part of Europe. Helix is reduced to a sixth 

 part of the whole number. Pupa remains very subor- 

 dinate, and Helicina and Ci/clostoma are merely repre- 

 sented. In the Cuban list of M. De la Sagra, Tebenno- 

 phorus, Vitrina, and Vertigo are wanting ; and a single 

 Vaginulus represents the whole family of Limacidce. 



