384 IDOTEIDA. 
ISOPODA. IDOTEID&., 
NORMALIA, 

IDOTEA PELAGICA. 
Specific character. Front of the cephalon slightly notched ; lower antennz 
about one-third of the length of the animal, which is narrow, but with the 
middle segments rather widest. Pleon with the first two joints distinct, the 
third with the sides only distinct, united with the fourth in the middle ; 
fourth joint large, with a slight keel down the middle, rounded at its ex- 
tremity, with a small blunt tooth in the middle, 
Length, half an inch, 
Idotea pelagica. Luacu, Trans. Linn. Soc. xi. p. 365. Suppl. Ene. Brit. 
1.426. Dzsmanust, Cons. Crust. p. 289. SaMovELLE, 
Ent. Comp. p. 106. Murine Epwarps, Crust. iii. p. 129. 
Waritr, B. M. Cat. Brit, Crust. p. 65. Pop. Hist. 
Brit. Crust. p. 223. 
Idotea marina. Faprictus, Ent. Syst. Suppl. p. 303 ? 
Oniscus balthicus. Pauuas, Spic. Zool. ix. t. 4, f. 6 ? 
Rhetia pelagica, Leacu, MSS. 
Our figures of this species are drawn from Dr. Leach’s 
largest typical specimen in the British Museum Collec- 
