
MR. BRODERIP ON THE GENUS CHAMA. 305 
CHAMA PRODUCTA. 
Tab. XXXIX. Fig. 4. 
Chama testd subpurpured, creberrimé lamellosd, lamellis folaceis, integris ; valvd inferiore 
enormiter productd ; limbo integro, purpureo. 
Hab. ad Mexico. (Gulf of Tehuantepec.) 
The closely set foliaceous lamelle on the upper valve are almost entirely abraded in 
the specimen before me, which, it should be remembered, bears the marks of consider- 
able age. Those on the enormously produced lower valve are, on one side, in good 
preservation, and are not unlike in appearance to those of some of the Spondyli when 
they have grown in the same fashion. The interior of the shell, which has something 
of the aspect of a Gryphea, is white tinged with yellowish, and striped in the direction 
of the Jamelle with purple. The purple border on the smooth internal edge of the upper 
valve is of some width. 
Dredged up by Mr. Cuming from sandy mud at a depth of ten fathoms, attached to 
stones. 
CHAMA CORRUGATA. 
Tab. XXXVIII. Fig. 7. 
Chama testa corrugatd, rubro-purpured albo varid ; intis atro-purpured, limbo integro. 
Hab. in America Centrali. (Real Lleijos.) 
Found by Mr. Cuming attached to stones at low water. All the specimens which I 
have seen turn from right to left. 
CHAMA ECHINATA. 
Tab. XXXIX. Fig. 5, (Junior) ; 6, 7 (Senior). 
Chama testé albidd purpureo varid, spinis fornicatis echinatd ; intis atro-purpured vel sub- 
rubra, limbo integro ; dente cardinali rubro. 
Hab. in America Centrali. (Puerto Portrero.) 
The spines of this species, which are close-set and well developed in youth, are en- 
tirely abraded in age till nothing but corrugation is left externally. But as the animal 
advances in life, the interior of the shell is richly painted, till in old age it arrives to an 
intensity of dark purple difficult to imitate with colours however rich. At that period 
the cardinal tooth becomes of the hue of the bone of the red Coral (Isis nobilis), used 
for ornamental purposes. Fig. 6. represents the interior of the lower valve, and Fig. 7. 
the interior of the upper one. 
Found at low water attached to rocks. 
