CHAMA.—P.ate VIII. 
simeé appresso-laminatd, anticé rugosa, rude fimbriatda, 
inferiore levi, per basem lamellatd, valvarum margini- 
bus levibus ; albida, ferrugineo- fusco hic illic tincté. 
THE Panama Cuama. Shell ovate, circuitously trian- 
gular, affixed by the side, upper valve smooth and 
very minutely appressly laminated on the posterior 
side, rough and rudely fimbriated on the anterior, 
lower valve smooth, lamellated along the base, margins 
of the valves smooth ; whitish, stained here and there 
with rust-brown. 
Hab. Panama (attached to stones) ; Cuming. 
The upper valve of this shell is distinguished in a 
peculiar manner by its two-fold style of sculpture. 
Species 46. (Mus. Cuming.) 
CHAMA PRETEXTA. Cham. testd ovata, valvis ambabus 
concentricé pulcherrimé fimbriatis, fimbriis tenuibus sub- 
pellucidis, grandibus, plus minusve erectis, valvarum 
marginibus levibus ; pallidé croced, fimbriis supra ru- 
Sescentibus. 
THE FLouNcED CHama. Shell ovate, both valves very 
beautifully concentrically fimbriated, frills thin, subpel- 
lucid, large, more or less erect, margins of the valves 
smooth ; pale yellow, frills reddish beneath. 
Hab. P 
This truly delicate and beautiful, shell was received by 
Mr. Cuming from a continental naturalist of some celebrity 
as the C. croceata of Lamarck, but it does not answer to 
the description. There are several Lamarckian species of 
this genus, and even the Linnean C. gryphoides, which it is 
quite impossible to indentify with the least degree of 
certainty. 
