THE COMMON MARINE SHELLS OF THE BOMBAY SHORE. 341 
Venus imbricata (Sow.) is a very small shell found in great 
quantity amongst shingle. White, sometimes yellow or purple-tinged 
towardsthe umbo, Radiately ribbed. Ribs about 13—19 and noduled. 
Length 2” and nearly the same breadth, 
Circe divaricata (Chem.).—Shell oblong, oval, flattish, thick, radiately 
ridged, ridges diverging from umbo and centre line of shell, also 
partially concentrically ridged, giving a beaded appearance in places. 
Colour fulvous-white, mostly streaked or blotched with red brown. 
Sinus inflection hardly noticeable. 
Size 1)" & 12" 
Dosinia or Artemis——There: are four species of this genus, all 
more or less circular in shape and closely concentrically striated. 
The umboes are pointed and curled, and stand out of the circular contour 
more or less. Immediately under the umboes is a small heart-shaped 
impression indented in the shell. Sinus large and pointed, extending 
to middle of valve. 
D. prostrata (Linn.) is a large flat fawn-coloured, shining shell, 
Ntriations at sides run into converging ridges, 
Diameter about 2", : 
D. pubescens (Phil.).—White, sometimes faintly pink tinged ; finely 
silkily striated. Most frequently found about the size of a 4-anna 
piece, but grows to 14” diameter. ; 
D. rustica (itomer) is a rough chalky-looking shell about the 
size of a rupee. Striations fine and becoming ridged at the sides, 
D. gibba (Adams) is about the same size as the last, but the umbo 
is much produced, destroying the circular form, The shell, too, is 
thinner and more swollen towards the umbo. ‘he heart-shaped 
impression is comparatively Jarge and faint; pure white and finely 
evenly striated, 
Donax or Wedge-shells——We have three members of this genus, 
Ligament short, and side of shell on which it lies (the posterior side) 
truncated. Sinus deep, Shell inequilateral. 
D. scortum (Linn.).—Easily known by the polished purple interior 
_ and the sharply truncated side ending in a point at the ventral border, 
Outwardly the shell is brownish-grey concentrically striated, forming 
ridges towards anterior side. Shell also radiately striated, especially 
on anterior side, 
Size 2" x 1)”, 
