20 



SHELLS AND SHELL-FISH. 



PART I. 



of Humphrey, Lamarck, and Cuvier. The two first 

 of these will therefore be exhibited in their details ; 

 the latter having already been placed before the reader 

 in a former volume. Although that of Lamarck, by 

 common consent, has been preferred by nearly all zoo- 

 logists, it is but justice to the distinguished author of 

 the Regne Animal, to designate his early Memoires 

 upon these animals as fully entitling him to the high 

 reputation his anatomical talents have so justly acquired 

 for him in other departments. They are materials upon 

 which all true knowledge of the Testacea must repose. 

 (17-) The conchological arrangement of Humphrey, 

 already spoken of, will now be detailed, so far, at least, 

 as regards the names of the genera ; since their de- 

 finitions were never published. To show how intimately 

 very many of these accord with those of Lamarck, we 

 have, in almost every instance, added the corresponding 

 genus of the latter. The ingenious author had such a 

 conviction that the fluviatileand terrestrial genera should 

 be kept distinct from the marine, that he places them 

 in separate divisions.* 



Class TESTACEA. 

 Order I. MARINE. 



* The author, with that modesty which was his peculiar characteristic, 

 thus expresses himself: — " I'he editor hopes that his confession of being 

 but little acquainted with the learned languages will be received as an 

 apology for such improprieties in the generic orspecific names as he fears 

 will be found."— Museum Calon/ieanum, pref. p. v. 



