408 



ISOPODA. 

 NORM ALIA. 



SPH.EROMID.E. 



8PHJf.R0MlDM. 



SPHiEROMA RUG] CAUDA. 



Specific cliaraclcr. Body smooth, moderately convex ; tail rounded and 

 entii-e at tbe extremity, its iijiper surface rugose ; outer division of its lateral 

 ajipendages oval and entire. 



Length, four-tenths of an inch. 



Spharoma rwjicauda. Leach, Edinb. Enc. vii. pp. 405 and 433. Trans. 

 Linn. Soc. xi. p. 369. Dictionn. Sci. Nat. xii. 

 p. 346. DusMAKEST, Cons. Crust, p. 300. Milne 

 Edwards, Cru.st. iii. p. 207. Johnston, Zool. 

 Journ. 3, 180. White, B. M, Cat. Brit. Crust, 

 p. 75. Pop. Hist. Brit. Crust, p. 245. 



This species closely resembles the preceding, but it is 

 less convex, and is easily distinguished by the rugose or 

 granulated upper surface of the tail, and sometimes of 

 the hinder segments of the body, and the simple outer 

 margin of the external division of the uropoda. 



The head is narrower than the following segment, 



