ISOPODA. 



NORMALIA. 



SPH.EROMA SERRATUM. 405 



SPHJSROMlDJi. 



SPH^ROMA SERRATUM. 



Specific character.* Smooth, oval, very convex ; pleon rounded at the 

 extremity, which is entire ; outer division of the terminal appendages of the 

 pleon slightly serrated, extending as far back as the extremity of the last 

 segment. 



Length, about half an inch. 



Onlscus serratus. FABRICIUS, Mant. Inst. 1, p. 242. 



Cymothoa serratum. FABRICIUS, Ent. Syst. ii. p. 510. 



Sphxroma serrata. LEACH, Edinb. Enc. vii. p. 405. Suppl. Enc. Brit. 



1427. Trans. Linn. Soc. xi. p. 368. Diet. 



des Sci. Nat. xii. p. 346. SAMOUELLE, Ent. Com- 



pend. p. 108. DKSMAREST, Cons. Crust, p. 301, 



t. 47, f. 3. LATREILLE, Ency. Meth. x. p. 458. 



GUERIN MENEV., Icon. R. An. Crust, t. 30, f. 1. 



MILNE EDWARDS, Crust, iii. p. 205, t. 31, f. 11. 



WHITE, B. M. Cat. Brit. Crust, p. 75. Pop. Hist. 



Brit. Crust, p. 245, pi. xiii. f. 6. GOSSE, Man. 



Mar. Zool. i. f. 235. 



