THE COMMON MARINE SHELLS OF THE BOMBAY SHORE. 339 
SINUPALLIA.—Ineament Exrernat. 
VENERACEA. 
Cypricardia, bellicata (Reeve).—This is a smallish, dull, chalk-white 
shell, shaped something like a bean, very inequilateral ; in fact the 
umbo is quite at one side. It is smooth, but irregularly roughly 
ridged or striated with the lines of growth. Hinge teeth one small 
one on each valve, Sinus slight. 
Size 12” %& 2", 
We now come to seven shells which are much mixed up in sub- 
classes, but which I shall endeavour to take together under some lead- 
ing features. 
They are all polished shining shells, thickish, with 2" sharp closely 
set prominent teeth in the hinge, and are generally smooth and — 
coloured, 
Meretrix morphina (Lam.) is about the largest, very shining, thick 
and smooth, and ofall colours, from pale buff to deep rich brown. Shell 
somewhat triangularly cut and ventral border rounded. Umboes 
nearly straight, making valve not far off being equilateral. Sinus very 
slight. 
Size 24” x 2”. 
The shells figured in Reeve as Cytherea castanea, C. petechialis, and 
C. impudica appear also to be this species. 
Chione pinguis (Hind’s) is also very shining and smooth, but the shell 
is much thinner and more swollen, especially towards the umboes. 
Colour generally light or dark slate with concentric bands or wavy lines. 
Shape ovalish, umboes curling away from the ligament side of the 
shell, which side is produced or elongated. Sinus broad, deep, and 
oval. 
Size 2" x 123", 
Chione radiata (Chem.)—-Similar in shape to the last, but more 
oval, flatter, not so shining, and with irregular concentric striations, 
Umboes straightish and not very prominent, i.e. they do not much 
distort the general oval shape of the valve. Sinus deep and oval. 
In colouring, this shell, as is the case with many of the bivalves, 
defies description. Young specimens have a reddish tinge which 
turns to brown or grey when older, and many are marbled or clouded 
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