CHAMA. 
Prats VII. 
Species 34. (Mus. Cuming.) 
CHAMA VENOSA. Cham. testé circuiter trigond, lateraliter 
afivd, valvis ambabus levibus, radiatim subobsolete tri- 
costatd, costis asperé nodulosis ; albd, Uineis purpureo- 
roseis obliquis undique venosd, intus alba. 
THE VEINED CHAMa. Shell circuitously triangular, affixed 
by the side, both valves smooth, radiately somewhat 
obsoletely three-ribbed, ribs roughly noduled ; white, 
obliquely veined throughout with purple-rose lines, 
interior white. 
Hab. ? (attached to shells.) 
The blood-red lines with which the entire surface of 
this shell is painted are not less characteristic than the 
three faint sharply noduled ribs. 
Species 35. (Mus. Cuming.) 
CHaMa ECHINATA. Cham. testé subtrigono-ovatd, latera- 
liter afixd, valvis ambabus spinis brevibus tubulosis 
erectis profuse echinatis, valvarum marginibus levibus ; 
albidd, ferrugineo- vel purpureo-fusco posticé tinctd, 
intus croceo-coccineo cardinem versus tinctd. 
THE PRICKLY CHama. Shell somewhat triangularly 
ovate, affixed by the side, both valves profusely 
prickled with short erect tubulous spines, margins of 
the valves smooth; white, stained on the posterior 
side with purple or rust-brown, interior tinged near 
the hinge with saffron-scarlet. 
Broperip, Trans. Zool. Soc. vol. 1. p. 305. pl. 39. f. 5. 
Hab. Porto Portrero, Central America (attached to rocks 
at low water); Cuming. 
Profusely studded with small tubulous spiniform scales. 
Species 36. (Mus. Cuming.) 
Cuama Janus. Cham. testd circuiter trigond, valvé 
inferiore et dimidio postici superioris levibus vel obliqué 
obtusé liratis, squamarum brevium seriebus duabus ra- 
diantibus, valvé superiore undigque irregulariter ap- 
presso-squamata, valvarum marginibus levibus; pur- 
pureo-rufa, liris obliquis squamisque albis. 
THE TWO-FACED CHama. Shell circuitously triangular, 
lower valve and posterior half of the upper smooth 
or obliquely obtusely ridged, with two radiating rows 
of short scales, upper valve irregularly appressly 
squamate throughout, margins of the valves smooth ; 
purple-red, oblique ridges and scales white. 
Hab, Gallapagos Islands (attached to the large Avicule) ; 
Cuming. 
The general aspect of this shell is not much unlike that 
of C. venosa, but the difference may be easily detected 
on examination; instead of being veined with fine lines 
of colour upon a white ground, the oblique ridges are 
raised upon a red ground, besides which the upper valve is 
characterized by a double style of both colour and sculpture, 
the anterior half being of a dull brick red colour and 
appressly scaled, whilst the posterior half is similar to the 
under valve. Mr. Broderip has figured this shell as the 
young C. imbricata, but it is far removed from that species, 
an immature example of which I have specially represented 
in the preceding plate at Fig. 3, 6. 
Species 37. (Mus. Cuming.) 
CHaMA RUBEA. Cham. testi ovatd, circuiter trigond, 
valvis ambabus rudé flecuosis et appresso-laminatis, 
squamis perpaucis, valvarum marginibus subtilissime 
crenulatis ; purpureo-rubra, squamis albidis, intus alba, 
margine purpurea. 
THE RUDDY Cuama. Shell ovate, circuitously triangular, 
both valves rudely flexuous and appressly laminated, 
with avery few scales, margins of the valves very finely 
crenulated; purple-red, scales whitish, interior white, 
purple at the edge. 
Hab, Cagayan, Island of Mindanao, Philippines (attached 
to stones) ; Cuming. 
The under valve of the specimen here represented is 
more squamate, and the scales are more erect, than the 
upper. 
Species 38. (Mus. Cuming.) 
Cuama ExoGyRa. Cham. testd ovatd, circuiter trigond, 
valvis ambabus confertissime appresso-laminatis, laminis 
rugosis subsquamatis, valvarum marginibus levibus ; 
lutescente-albd, roseo tincta. 
THE OUTWARDLY-REVOLVED CHAMA. Shell ovate, circui- 
tously triangular, both valves very closely appressly 
laminated, laminze rough, somewhat scaled, margins 
of the valves smooth; yellowish-white, tinged with 
Tose. 
January, 1847. 
