408 SPH EROMIDA. 
ISOPODA. SPHAROMIDA. 
NORMALIA, 

SPHA ROMA RUGICAUDA. 
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. 
Spheroma rugicauda. Leacu, Edinb. Ene, vii. pp. 405 and 433. Trans. 
Linn. Soc. xi. p. 369. Dictionn. Sci. Nat. xii. 
p. 346. Dxsmarzst, Cons. Crust. p. 300. Minne 
Epwarps, Crust. ili. p. 207. Jounston, Zool. 
Journ, 8, 180. Wurrr, B. M. Cat. Brit. Crust. 
p. 75. Pop. Hist. Brit. Crust. p. 245. 
Tuts 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, 
