found on the South Coast of Devonshire. 71 



tenure four, the upper pair longest, but not half so long as the 

 body : eyes large, of a garnet colour, immoveable : arms four, of 

 a very singular form ; the foremost pair with a sub-globose, cheli- 

 form hand, with the fixed claw very slender, and the moveable 

 one, or thumb, long and double jointed, or furnished with an ad- 

 ditional hooked fang at the end : second pair with an ovate-oblong 

 hand furnished with one long moveable hooked fang ; at the 

 wrist arises a compressed slender plate, projecting forward, and 

 almost meeting the fang when closed: legs five pairs, small, subu- 

 late : tail terminated by several slender, flat, caudal fins. 



Length, half an inch. Inhabits the deep : taken by the dredge 

 amongst shells and algae. 



Oniscus hirsutus. 

 Tab. VI. Fig. 7. 



With an oval body with six convex hirsute joints, independent 

 of the head and posterior plate ; this last is large, very convex, 

 and rounded at the end, furnished on each side with a lono- ser- 

 rated oar or fin : antennae obsolete : legs eight, provided with 

 double claws. 



Length, one-eighth of an inch. Colour brown, with sometimes 

 a few faint blueish spots on the posterior joint. 



Oniscus cylindraceus. 

 Tab. VI. Fig. 8. 



With a smooth, glossy, cylindric, and very convex body, with 

 seven joints, independent of the head, tail, and five narrow seg- 

 ments at the base of the latter : central caudal fin subovate, with 

 two smaller lateral ones on each side, which, when spread, give 

 it a quinquedeatate appearance : antennae four, short, the upper 



pair 



