ASELLUS AQUATICUS. 



ISOPODA. 

 NORM All A. 



343 



ASELLlDtf. 



ASELLUS AQUATICUS. 



Specific character. Upper antennae reaching to the extremity of the 

 peduncle of the lower; flagellum of the lower twice the length of the 

 peduncle. Pereion of a greyish colour, mottled with paler markings ; pedun- 

 cle of the caudal appendages nearly half the length of the slender terminal 

 subequal filaments. 



Length of the male, nearly half an inch ; female, much smaller. 



Oniscus aquaticits. LINN. Syst. Nat. ii. p. 1061. ROKMKR, Gen. Ins. 



pi. 30, fig. 12. 

 Ci/mothoa aqmtica. FABRICIUS, Ent. Syst. ii. p. 505; Ejusd. Suppl. 



p. 303 (Idotea aq.). 



L'AseUe. GEOFFROY, Ins. Paris, ii. p. 672, t. 22, f. 2. 



Asellus aquaticus. OLIVIER, Enc. Meth. iv. p. 252. LEACH, Trans. 



Linn. Soc. xi. p. 373. GUERIN MENEVILLE, 



Icon. R. An. Crust, t. 31, f. 3. SAMOUELLE, 



Ent. Compend. p. 110. WHITE, B. M. Cat. 



Brit. Crust, p. 69 ; Pop. Hist. Brit. Crust. 



1. 230, pi. 12, f. 6. 



