408 



ISOPODA. 



NOR MALI A. 



SPHJ3ROMIDJ;. 



SPH/EROMA RUGJCAUDA. 



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

 entire at the extremity, its upper surface rugose ; outer division of its lateral 

 appendages oval and entire. 



Length, four-tenths of an inch. 



Sphceroma ruyicauda. LEACH, Eclinb. Enc. vii. pp. 405 and 433. Trans. 

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

 p. 346. DESMAREST, Cons. Crust, p. 300. MILNE 

 EDWARDS, Crust, 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, 



