Class V. ONISCUS. 39 



with six membranaceous, transversely striated 

 scales or plates. Tab. xix. Jig, 6. 



Gm. Lin. 300Q. t. 4. f. 12. 7- Asilus, 



Pallas, spic. Zool. ix. 71. Gronov. Zooph. 997. Two-plated, 



[O. with an hard convex body j head narrower ; 

 tail semi-oval ; abdomen of the female covered 

 with two or three lamina, which conceal the 

 eggs ; color of the back blackish brown. 



This insect is found throughout the vast ex- 

 tent of the eastern and western oceans, in the 

 Mediterranean and the northern seas, and in- 

 fests all the softer species of fish. 



Pallas spic. Zool. ix. 70. t. 4. f. 18. 18.* 8. Globa- 



TOR. 



[O. much resembling the preceding species, but 

 smaller; rolls itself like the land species, the O, 

 Armadillo. 



Adams in Lin. Tr. v. i. 8. f. 3, 4. 9. Bidemta- 



tus. 



[O. with seven scales, the last bidentate ; abdo- 0T e 

 men without plates ; upper side marked with 

 six transverse rows of ochreous spots ; length 

 half an inch. Observed in Milford Haven. 



