ARCTURUS LONGICORNIS. 865 
ISOPODA, ARCTURIDA. 
NORMALLIA. 

ARCTURUS LONGICORNIS, + 
Specific character. Moderately slender. Four anterior segments of the 
body strongly tuberculated. Upper antenne reaching to the tip of the 
second joint of the inferior. Flagellum longer than the two-preceding joints 
together. Second, third, and fourth segments dilated over the place of in- 
sertion of the legs. : 
Length of the body, one inch. 
Oniscus longicornis, Sownrsy, Brit. Mise. t. 19. 
Arcturus longicornis. Wxstwoop, in Trans, Ent. Soc. Lond. 1, 72, t. 16. 
Guérin Ménév. Icon. R. An. Crust. t. 31, f. 2. 
Mitne Epwarps, Crust. iii. p. 124. Wun, Cat. 
Brit. Crust. Brit, Mus. p. 63. Pop. Hist. Brit. 
Crust. p. 221, pl. xii. f. 1. Gossz, Man. Mar. 
Zool. 1, fig. 249. 
Astacilla longicornis. Furmrne, Edin. Enc. vii. p. 502. Jounston, in Lou- 
don’s Mag. Nat. Hist. viii. p. 494, f. 44, adult ; 
ix. p. 80, f. 15, young. DatryEnt, Powers of 
Creator, 1, p. 226, pl. lxiii. figs. 1—4. 
Leachia lacertosa. Jounston, Edinb. Phil. Journ. xiii. p. 220. 
