CHAMA. 
Puate V. 
Species 23. (Mus. Cuming.) 
CuaMa sorpIpA. Cham. testd ovatd, valod inferiore in 
atate valde converd, valvis ambabus undique creberrime 
striatis, striis elevatis, subundulatis, ab umbonibus radi- 
antibus, hine et hinc foliaceis, foliis postice seriatis, val- 
varum marginibus crenulatis ; corallo-rubescente, intus 
albidé. 
un MEAN Cuama. Shell ovate, lower valve increasing 
very much in convexity with age, both valves very 
‘closely striated throughout, striz raised, slightly un- 
dulately radiating from the umbones, here and there 
foliaceous, the foliations on the posterior side in rows, 
margins of thevalve crenulated; light coral red, interior 
white. 
Broperip, Trans. Zool. Soc., vol. i. p. 309. pl. 39. f. 8, 9. 
Had. Isle of Cuna, Central America (dredged from a depth 
of eighteen fathoms attached to rocks); Cuming. 
The name awarded to this species by Mr. Broderip is 
rendered inapplicable by the circumstance of its having 
been found in much finer state of beautiful clear coral-red 
colour, sculptured throughout with fine undulating raised 
strize, radiating from the umbones. 
Species 24. (Mus. Cuming.) 
CHaMa ASPERSA. Cham. testi ovatd, valod superiore pla- 
nulatd, spinis parvis fornicatis marginem versus longi- 
usculis erectis profuse concentricée dispositis, inferiore 
subprofunde convena, squamis lamellatis ad marginem 
spineformibus confertissime ornatd, valvarum margini- 
bus levigatis; alba, ferrugineo-rubro radiata vel as- 
persia. 
THE sPRINKLED CHama. Shell ovate, upper valve flat- 
tish, ornamented with profuse concentric rows of 
small vaulted spines, rather long and erect towards 
the margin, lower valve rather deeply convex, with 
very close-set lamellated scales, spine-shaped at the 
margin, margins of the valves smooth; white, rayed 
or sprinkled with rust-red. 
Hab. Tacloban, Isle of Leyte, Philippines (attached to 
stones); Cuming. 
In this species, as in most of the genus, especially those 
that attach in groups, the spinous or squamate sculpture of 
the upper valve becomes modified into lamelle in the 
lower, for the purpose of gaining attachment. 
Species 25. (Mus. Cuming.) 
CAMA PLANATA. Cham. testd suboblongo-ovatd, planius- 
culd, valvd superiore profuse squamatd, squamis brevibus, 
minutis, subappressis, ab umbone seriatim radiantibus, 
inferiore levi, squamis grandibus rudis per basem, val- 
varum marginibus levibus; alba, ferrugineo-rufo ab 
umbonibus radiata. 
THE FLATTENED Cuama. Shell somewhat oblong-ovate, 
rather flattened, upper valve profusely scaled, scales 
short, minute, rather pressed forward, radiating in 
rows from the umbone, lower smooth, with large 
rude scales along the base, margins of the valves 
smooth; white, radiated from the umbones with 
rust-red. 
Hab. Island of Guimaras, Philippines (attached to stones) ; 
Cuming. 
The general aspect of this species is not much unlike 
that of the preceding, but it will be found on comparison 
to differ throughout; in form it appears naturally flatter, 
in colour more distinctly rayed, and the sculpture of the 
valves is of a different system and more than usually dis- 
similar. 
Species 26. (Fig. a and 6 Mus. Cuming.) 
CHAMA ARCINELLA. Cham. testd cordatd, antice lunuld 
ampld depressd infra umbones ; valvis ambabus, simi- 
libus, radiatim costatis, costis multispinosis, spinis inter- 
dum longissimis, tubulosis, spinarum interstitiis semper 
peculiariter excavato-punctatis, valvarum marginibus 
subtilissimé crenulatis ; albd aut lutescente, sepissime 
rosed, intus aurantid, interdum autem raro vivide pur- 
purea. 
THE LITTLE ARCHER Cuama. Shell heart-shaped, with 
a large depressed lunule beneath the umbones, both 
valves radiately ribbed, the ribs many-spined, spines 
sometimes very long, tubulous, interstices between 
the spines peculiarly excavately punctured, margins 
of the valves very finely crenulated; white or yel- 
lowish, most frequently stained with pmk-red, interior 
orange, sometimes, but very rarely, deep purple. 
Linnzus, Syst. Nat. (12th edit.) p. 1189. 
Hab. West Indies (attached to shells, particularly the 
Strombus pugilis.) 
This well-known species is extremely variable in size, 
December, 1846. 
