426 SPH HROMID A. 
ISOPODA. SPHMROMIDA. 
NORMALIA. 

CYMODOCEA TRUNCATA. 
Specific character. Pleon slightly granulated ; fourth segment with two 
small tubercles in the middle of the hind margin ; terminal segment with 
two larger dorsal tubercles, followed by a central oval, very setose tubercle, 
and three terminal spines, which are truncated. 
Length, five-twelfths of an inch, 
Oniscus truncatus. Montacu MSS. in Brit. Mus. 
Cymodocea truncata. oe Edinb. Ene. vii. p. 483. Trans. Linn. Soc. 
xi. p. 303. Suppl. Enc. Brit. i. 427. Dictionn. Sci. 
Nat. xii. p. 848, Samountiz, Ent. Compend. p. 108. 
DrsmarEst, Cons. Crust. p. 297. Minne Epwarps, 
Crust. iii. p. 214. W. Tompson, in Ann. Nat. 
Hist. xx. p. 246. Wauuitz, B. M. Cat. Brit. Crust. 
p. 76. Pop. Hist. Brit. Crust. p. 246. Gossz, 
Man. Mar. Zool. 1, fig. 236. 
Our figure of this species is made from Dr. Leach’s 
typical specimen preserved in the British Museum. It 
is very nearly allied to the following species, but it is 
much less rugose, and the form and size of the lateral 
appendages of the tail are different in the two species. 
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