Class V. 



ONISCUS. 



41 



Mont, in Lin. Tr. ix. 103. t. v. /. 6. 



* O. slender, subcylindric, of eight joints ; tail 

 of five truncated divisions ; antennce four, short ; 

 the anterior pair of legs considerably the largest ; 

 color pale, clouded with rufous 

 lines. 



13. Graci- 

 lis. 

 Slender. 



Length five 



Mont, in Lin. Tr. ix. 103. t. iii. f. 3, 4. 



* O. body obovate, distorted, of about fourteen 

 indistinct joints, the eight foremost terminated 

 at the ends, each with an oar-like cirrus, the 

 six posterior joints have also cirri, branched at 

 the ends into fasciculi or tufts. The female, 

 like others of this genus, has large abdominal 

 valves to protect the eggs, which in this are 

 very numerous, and of a pale orange color. 

 Color orange. Length scarcely half an inch. 

 Inhabits the thorax of Cancer subterraneus. 



14. Thora- 

 cicus. 



Thoracic. 



Mont, in Lin. Tr. ix. 104. 



* O. body ovate, distorted, of thirteen joints, 

 forming as many scallops at the sides. Color 

 pale greenish. This is likewise a parasitic spe- 

 cies, inhabiting the same part of the prawn as 

 the former of C. subterraneus ; the distortion of 



15. Squil- 



LARUM. 



Praivn-tho- 

 racic. 



