CHAMA. 87 
Chama semtorbteulata, 
The Cardita phrenetica (Chemn. Conch. Cab. vol. vii. pl. 50, 
f. 502, 503) has been suggested by Bruguiére and Deshayes as 
the Chama semiorbiculata of Linneus, and assuredly the de- 
scription in the ‘Museum Ulvice’ agrees most fairly with the 
characteristics of the shell. Of that species there is a specimen 
in the Linnean cabinet, which alone answers to the definition, 
yet, since it is not marked, and as our author has not asserted 
his possession of it, its mere presence adds but little weight to 
the accepted recognition. 
Chama calyculata, 
The name calyculata suggests the idea of a cup-bearing 
shell, and the image of the Cardita concamerata is called up by 
the specific appellation. This conjecture, nevertheless, is not 
confirmed by the description, where no mention is made of any 
calyx-like appendage. Of the contents of the Linnean cabinet 
two species alone, the Cardita calyculata and the C. variegata, 
possess the requisite characters enumerated in the description. 
Of the former there are many specimens, of the latter only a 
single valve, which was not found with the other shells, but in 
a drawer of mixed specimens that are suspected to have once 
been the property of Linneeus. Both answer alike to the 
diagnosis, yet one alone can retain the name. The Mediter- 
ranean locality, coupled with the omission of all mention of the 
strongly marked variegation, favour the claims of the C. caly- 
culata of Philippi (Reeve, Conch. Icon. vol. i. Cardita, pl. 1, f. 1). 
In the tenth edition of the ‘Systema’ the only engraving 
quoted was that of Gualtier, which fairly enough resembles the 
true calyculata; the reference to the figures of Adanson and 
‘Lister, which represent two different Cardite was erroneously 
appended at a subsequent period. 
