76 MOLLUSCA. 
alterations since the days of Linnzeus. As originally con- 
structed by that author, it contained shells which differ 
widely from one another in habit andform. Bruguiére, 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 thussuppressed entirely 
the Linnean 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, has 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 LZ. scalpellum of the second. 
The genus balanus, as thus formed by Bruguiére, and re- 
presented by the lepas balanus of Linnzeus, 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 arez, six of these being depressed, 
andsix 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 coronolule, 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 Museum, vol. i. p. 465), endea- 
