574 



ECHINODERMATA HOLOTHUROIDEA 



marked sole, to which the tube-feet are confined, wliilst the 

 dorsal radial canals, and consequently all the dorsal tube-feet, are 

 absent. The dorsal ossicles are enlarged to form a complete mail 







Fig. 2QQ.—Phyllophon(s tirna. x 1. 



Fig. 'IGl.-- /'solus cphipivfer. x 3. A, with feelers retracted and brood-pouch closed ; 

 B, with feelers extended and some of the plates of the brood-pouch removed. 



(From Wyville Thomson.) 



of plates, recalling the corona of a Sea-urchin. The two British 

 species are small, and found in comparatively deep water, but 

 a fine large species is found in the Gulf of St. Lawrence, and 



