DYNAMENE RUBRA. 



419 



ISOPODA. 



NORM ALIA. 



DYNAMENE RUBRA. 



Specific character. Narrowly ovate, with the sixth segment simple ; outer 

 plate of the uropoda shorter than the inner ; central excavation in the 

 terminal margin of the pleon of equal width throughout. Colour reddish 

 or greyish buff, with black or red specks. 



Length, one-fifth of an inch. 



Oniscus ruler. MONTAGU MSS. 



Dynamene rulra. LEACH, Dictionn. Sci. Nat. xii. p. 344. DESMAKEST, 



Cons. Crust, p. 298. 

 Cymodocea nibra. MILNE EDWARDS, Crust, iii. p. 216. WHITE, B. M. Cat. 



Brit. Crust, p. 77. Pop. Hist. Brit. Crust, p. 247. 



THIS species is rather narrow in form, with the sides 

 of the body but little arched ; the sixth segment is con- 

 siderably larger than the seventh, and is unarmed at its 

 posterior margin ; the terminal segment of the tail is 

 large and very convex, and is terminated by a longitu- 

 dinal slit, which is nearly of equal width throughout its 



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