Class VI. DERRIS. IQl 



GENUS XXIII. DERRIS. 



Body detached, cylindrical, composed of arti- 



"!:■-' culations. 



Mouth terminal. 



Head with two simple cirri at the top. 



Adams in Lin. Tr. iii. 67. 



Turton Br. Faun. 132. 



1. SaST GUI- 



f. 13. f. 1,2. 





NEA. 



[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. 



A new genus, formed by Mr. Adams, of which 

 this is the only species now known. Ed. 



