160 



ISOPODA. 



ABERRANTIA. 



ANTHURIM, 



ANTHURA GRACILIS. 



Specific character. Long, slender, sub-compressed, sub-cylindrical. Seg- 

 ments of the body with a strong, lateral ridge ; terminal segments sub-trian- 

 gular. Four anterior segments of the pleon soldered closely together, forming 

 a subtriangular mass ; middle tail-piece keeled down the centre, with three 

 very delicate, longitudinal, raised lines, down the sides of the keel ; apex 

 truncate ; apex of the inner division of the lateral scales obliquely truncated, 

 and crenulated. 



Length 5 lines. 



Oniscus gracilis. MONTAGU, Trans. Linn. Soc. ix. p. 103, t. 5, fig. 6. 

 Anthura gracilis. LEACH, Edinb. Encyc. vii. p. 604. Trans. Linn. Soc. 



xi. p. 366. SuppL Enc. Brit. DESMAREST, Cons. 



Crust, p. 291, t. 46, fig. 13. SAMOUELLE, Entom. 



Compend. p. 107. GUERIN MENEVILLE, Icon. 



R. An. t. 30, fig. 6. MILNE EDWARDS, Crust, iii. 



p. 136, t. 31, fig. 3. WHITE, B. M. Cat. Brit. Crust. 



p. 67. Pop. Hist. Brit. Crust, p. 225, pi. 12, fig. 4.* 



GOSSE, Man. Mar. Zool. i. fig. 248. 



* In this figure two segments of the body and one of the pairs of legs are 

 omitted. 



