IDOTEA TRICUSPIDATA. 



ISOPODA. 



NORMALIA. 



379 



IDOTEIDJt. 



IDOTEA TRICUSP1DATA. 



Specific character. Elongate-subovate ; lower antennae nearly half the 

 length of the animal. Segments of the pereion (except the first) with dis- 

 tinct Jcoxal plates (epimerse) occupying the whole lateral margin. Pleon with 

 the first and second segments distinct, the third soldered in the middle to the 

 terminal large joint, which is more or less tridentate at the tip. 



Length of the body, about one inch and a third. 



Idotea tricuspidata. DESMAREST, Cons. Crust, p. 289 (and pi. 46, f. 11 ?). 



ROTJX, Crust. Medit. t. 29, f. 11, 12. MILNE 



EDWARDS, Crust, iii. p. 129. WHITE, B. M. Cat. 



Brit. Crust, p. 65. Pop. Hist. Brit. Crust. 



p. 223, pi. 12, f. 2. GOSSE, Man. Mar. Zool. 1, 



fig. 247. 

 Oniscus tridcns. SCOPOLI, Ent. Carniolica. OLIVIER, Enc. Meth. vi. 



p. 26. 

 Idotca Entoniuii. PENNANT, Brit. Zool. 4, pi. 18, f. 5. LEACH, Linn. 



Trans, xi. p. 364. 



