76 MOLLUSCA. 



alterations since the days of Linnaeus. As originally con- 

 structed by that author, it contained shells which differ 

 widely from one another in habit and form. Bruguiere, the 

 celebrated French conchologist, separated the fixed shells 

 furnished with an operculum, under the name of Balanus, 

 and those which were seated on a peduncle, he retained un- 

 der the generic name Anatifer. He thus suppressed entirely 

 the Linnaean name of the genus. To the name of his first 

 genus, we have no objections, but the second, though it re- 

 cords a curious fact in the history of popular errors, lias been 

 injudiciously selected. The name Lepas has been retained 

 by the best British writers, who have described seven species 

 which live in our seas. These are distributed into two sec- 

 tions, according as the valves are five or more in number. 

 The Lepas anatifera is an example of the first division, and 

 the L. scalpellum of the second. 



The genus balanus, as thus formed by Bruguiere, and re- 

 presented by the lepas balanus of Linnaeus, contained nine- 

 teen species. From these Lamark has separated the B. 

 diadema, testudinaris, and balanaris, to form his genus Co- 

 ronula. These shells are conical, and have the compart- 

 ments formed into twelve areae, six of these being depressed, 

 and six elevated. They chiefly inhabit the skin of the whale, 

 the base of the shell being placed in the fat. Lamark has 

 likewise formed another genus, from two species analogous 

 to the coronolulae, which he terms Tubicinella, and charac- 

 terises it thus : " Testa univalvis, regularis, non spiralis, 

 tubulosa, versus basin attenuata, utrique truncata ; apertura 

 orbiculata terminali ; operculo quadrivalvi." The lepas stri- 

 ata of Pennant is now the representation of a new genus 

 termed Creusia. 



M. Dufresne (Annales du Micseum, vol. i. p. 465), endea- 



