CONTINUED. 315 



posterior dorsal pairs of legs. This body is divisible into 

 a thin brown layer, with concentric fibres, and an ex- 

 ternal, white lamina, with radiating fibres, and a dark 

 central nucleus. I have frequently noticed precisely the 

 same peculiarity in Dromia verrucosipes, in the Meia-co- 

 shimah Group, and I believe naturalists have perceived 

 the same habit among other genera. Many of the spe- 

 cimens both of Dorippe and of Dromia which I examined 

 in this condition, had perfectly soft carapaces, and this 

 body may serve them as a protection during the season 

 of their moulting The Caphyra pectenicola (White) bears 

 a small pecten shell, in a similar manner. This curious 

 little Crustacean, which was dredged by us in the Sunda 

 Straits from thirteen fathoms, takes up its abode in the 

 deepest valve of the deserted Pecten, locking itself on by 

 the claws of its posterior legs to the ears of the shell, its 

 tender back being secured from harm by this adventitious 

 covering. Sir E. Belcher informs me that he discovered 

 another species in the Gulf of Papagaya, inhabiting the 

 single valve of a Terebratula, which was in a partially 

 softened condition. 



Many other genera, as Hyas, Maia, Arctopsis, Mithrax 

 and Pericera, are well known to have similar propensities, 

 loading their backs with foreign bodies, Sponges, Algae, 

 and other Phytozooic and vegetable productions. 



On the summits of the hills near the sea-coast of many 

 of these islands, and particularly on those of Koo-kien- 

 san, I procured numerous Talitri and Gammari from 

 among the roots of the long damp grass ; rather a re- 

 markable circumstance, as these Crustaceans are usually 

 found close to the margin of the sea, concealing them- 



