118 STAEFISH GALLEEY. 



are ordinarily divided into the Pedata and the Apoda ; the latter 

 are represented by Synapta, which may attain to a great length, and 

 by Ghiridota ; the Pedata are illustrated by the genera Gucumaria, 

 Psoitis, and Holothuria. Deep-sea investigations have revealed the 

 existence of another group of specially modified Holothurians — the 

 Elasipoda ; these are remarkable for their well-marked bilateral 

 symmetry and the distinctness between the dorsal and ventral 

 portions of the body ; the prominent processes on the dorsal surface 

 are not contractile. 



An exhibition of some interest is to be found in a Table-Case 

 against the wall (189-219), in which there are various specimens of 

 the edible Holothurians — trepang or heches-de-mer ; these were all 

 bought in the market at Canton, and may be taken to be typical 

 of the kinds offered for sale in various eastern countries. 



