ee == = 

MR. BRODERIP ON THE GENUS CHAMA. 303 
transparent ; and the white valves are striped or tinged externally with the same 
colours. In old specimens the foliations and lamelle are completely worn down, and 
the shell has somewhat of a crystalline appearance ; indeed it is always semitrans- 
parent. 
Dredged up by Mr. Cuming, attached to Stones, Mytili, and turbinated shells, at a 
depth varying from nine to eleven fathoms, from a bottom of coarse sand ; and also 
found under stones at low-water mark. 
CHAMA LOoBATA, 
Tab. XXXVIII. Figg. 4, 5. 
Chama testé alba, lobatd, subrhomboided, radiatim striata, lamellis creberrimis, jimbriatis, 
foliaceis, striatis ; limbo interno crenato. 
Hab. ad insulam Nevis. 
This shell is of a dead white, and striated, in a radiated direction, from the wmbones 
(which are sometimes tinged with brownish or yellowish) to the borders of the valves. 
The foliated fimbriations are close-set, and sometimes very much developed. The 
valves are sometimes tinged on the inside towards the umbones with yellowish and 
purplish ; and the internal border is strongly crenated. 
It was found attached to small stones and shells at Nevis in the West Indies in sandy 
mud, and at a depth ranging from four to ten fathoms. 
CuHAMa SINUOSA. 
Tab. XXXVIII. Fig. 6. 
Chama test suborbiculari, posticée sinuatd, lamellis medtocribus, plicatis, subdepressis, albd 
rufo-spadiceo maculatd ; intus albd, limbo interno levi. 
Hab. ad Brasiliam. 
This species, which in some points approaches the last, was brought from Brazil by 
J. Miller, Esq., Surgeon R.N. The differences are many, as will be seen on reference 
to the figure. The fine strie of the crowded lamelle, so remarkable in Chama lobata, 
are wanting in the comparatively distant lamelle of Chama sinuosa, which has the in- 
ternal borders of the valves smooth. 
Cuama Pacirica. 
Tab. XXXIX. Fig. 1. 
Chama testd rubrd, purpured vel luted, lamellis creberrimis, foliis seu squamulis brevioribus 
interdum albidis ; limbo interno crenato. 
Hab. in Oceano Pacifico. (Lord Hood’s Island, Pearl Islands.) 
The infinite varieties of this species in shape and colour defy description. In many 
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