336 Journal of the Asiatic Society of Bengal. [| Aug.-Sept., 1913. 
in origin was shown by the fact that they were far too 
ra ea cases being A Se half the size of the crab itself, 
and further, the intestinal contents are, on examination found 
to be quite soft and free from gritty matter. Apparently what 
happens is this ; the crab with its chelae shovels sand into its 
mouth and here a sorting process is carried out, anything 
those specimens, whose burrows were situated in the damp sand 
between high and low tide marks, were darker in appearance 
than those who inhabit the dry sand in the upper part of the 
beach 
ach. 
Along the edge of the scrub at the upper part of the beach 
in The two species of Sesarma were bot of a dark colour, 
but still showed a distinctly ‘‘ protective’ colouration. The 
examples of quadratum which were found frequenting 
crevices in the rocks and Stones, were of a dark-brown 
colour dotted over with grey and 
Charybdis (Goniosoma) affinis, Dana. 
Charybdis (Goniosoma) crucifera (Fabr.), A. M. Edw. 
Charybdis (Goniosoma) rostrata, A. M. Edw. 
b 
Matuta victor, Fabr., Hilgendorf. 
Varuna litterata (Fabr.), A. M. Edw. 
were obtained from the waters at the entrance, and the rock- 
pools were found to be Swarming with examples of a species of 
eander, many of which were ovigerous females. 
