S06 ON THE CLASSES OF THE 



propre d'animaux d'une seule classe, beaucoup de MoUus- 

 quesj d' Annelides, et tons les Cirrhipedes en sont munis." 



There remains therefore no vaUd reason for arranging the 

 Cirripeda with the Mollusca, but the circumstance men- 

 tioned by Cuvier, that one species of the genus Teredo, in- 

 habiting tropical chmates, carries on the back of each vah-e 

 of its shell an articulated process. Neither he nor Lamarck 

 however appears to have ever seen this shell, the Teredo 

 palmulatus of Adanson ; and Lamarck even suspects that 

 it will be found scarcely to differ from the common ship- 

 worm. But supposing this articulated, or, according to La- 

 marck, this subarticulated process to exist on the back of 

 a shell, — in proof of which existence I believe by the way 

 that there is abundant testimony, — what possible affinity 

 can there be between it and the articulated members of 

 a Cinipede i M . Lamarck, who, Avhile he considers the 

 Cirripeda to be Annulose animals, displays as much an- 

 xiety to make them approach to the Mollusca as Cuvier 

 himself, is too cautious to remark any affinity between a 

 Teredo and a Balamis. Nay, in alluding to the calamuli 

 of a genus of Mollusca bordering on Teredo, namely Fis- 

 tulana, he expressly says " Ce lie sont point des bras ar' 

 iiciiles analogues a ceux des Cirrhipedes, puisque lew 

 jyedicule filiforme, Jistuleux, et calcaire est sans articida- 

 tions" And so desirous is this able classifier that he shall 

 not be supposed to have pointed out any affinity as ex- 

 isting between the Mollusca and the Cmipeda, that 

 •when he has made these last immediately to precede his 

 Conchiftres, he will not commence the description of any 

 ti'ue Mollusca, until he has laid it down as certain, 

 " quits ne se lient point aux Cirrhipedes, malgre. les ap- 

 paroiceS de rapports qu'offrent les Brachiopodes et les 



