44 THE ELEMENTS 



1st. The second family is the anati« 

 ferous, or goose-bearing shells, as they 

 are called, which is connected to, and 

 supported at the base by a tendinous 

 tube or pedicle, which being of a flex- 

 ible nature, allows the animal to writhe 

 about in quest of food ; it has no oper- 

 culum, is wedge-shaped, and consists 

 of ^\e or more unequal valves. Plate 

 1st, fig. 2nd. 



Mr. Montagu in his Testacea Bri- 

 iannica, made those two families into 

 two distinct genera. It is singular 

 Linn6 should have arranged shells so 

 very dissimilar in the same genus. 



Habitation. The Lepas have only 

 been found to inhabit the ocean. 



The shells of this genus adhere in 

 clusters to rocks, shells, floating wood, 

 and other extraneous substances, and 

 being incapable of changing place, 

 are supposed to be true hermaphro- 

 dites. 



In Turton's Linne thirty-two spe- 



