CHAMA.—Ptrate V. 
frequently attaching in groups like a bunch of nuts; the 
long-spined variety is of a more free and unrestricted growth. 
Species 27. (Mus. Cuming.) 
CHAMA FIBULA. Cham. testé orbiculari, valvé superiore 
squamis brevibus lamellatis concentricé confertissime ex- 
sculpti, inferiore squamis paucioribus, elongatis, plano- 
appresis, crenulatis; nived, ferrugineo-fusco interdum 
pallidé tincté, umbonibus peculiariter violaceis ; intus 
albé, ab umbonibus violaceo-purpureo radiata. 
THE BUTTON CHama. Shell orbicular, upper valve very 
closely concentrically sculptured with short lamellated 
scales, lower valve with fewer scales elongated and 
flatly appressed, margins of the valves very minutely 
crenulated; snowy white, sometimes palely stained 
with rust-brown, umbones peculiarly tinged with 
violet ; interior white, rayed with violet purple from 
the umbones. 
Hab. Island of Luzon, Philippines (attached to coral); 
Cuming. 
A delicate rounded species, tinged with purple at the 
umbones both externally and internally. 
Species 28. (Mus. Cuming. 
Cuama optrquaTa. Cham. testé oblique ovatd, trigond, 
lateraliter affixd, valud superiore profuse minutissime 
squamatd, squamis ab umbone oblique radiantibus, ad 
marginem subspinosis, iuferiore compariter levigata, 
per basem rudé lamellaté, valvarum marginibus interne 
minutissine crenulatis; albo fusco-purpureoque fere 
omnino tincté et radiata, intus albida. 
THE oBLIQUE CHama. She'l obliquely ovate, triangular, 
affixed by the side, upper valve profusely very mi- 
nutely scaled, scales radiating obliquely from the 
umbone, spinous at the margin, lower comparatively 
smooth, rudely lamellated along the base, margins of 
the valves internally very minutely crenulated ; white, 
almost entirely stained and rayed with rust and brown 
and purple; interior white. 
Hab. Catbalonga, Isle of Samar, Philippines (attached to 
stones); Cuming. : 
Distinguished by its oblique triangular growth, darkly 
rayed and stained with colour and extremely minutely 
scaled. 
