Class VI. DERRIS. 101 



GENUS XXIII. DERRIS. 



Body detached, cylindrical, composed of arti- 

 culations. 

 Mouth terminal. 

 Head with two simple cirri at the top. 



Adams in Lin. Tr. in. 67. Turton Br. Faun. 132. J. Sangui- 



t. 13. f. I, 2. 



[D. body covered with a membranaceous trans- 

 parent coat, through which the internal parts 

 are visible; head extended beyond the outer 

 skin, connected to the anterior part of the body 

 by a membranaceous covering forming a neck ; 

 mouth with two lips, one straight and fixed, 

 the other hooked and moveable ; length rather 

 more than an inch. 



Anew genus, formed by Mr. Adams, of which 

 this is the only species now known. Ed, 



NEA. 



