IDOTEA TRICUSPID AT A. 



ISOPODA. 



NORMALIA. 



379 



IDOTEIDjS. 



IDOTEA TRICUSPIDATA. 



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

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

 tinct ^coxal plates (epimerce) 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 trkuspidata. Desmarest, Cons. Crust, p. 289 (and pi. 46, f. 11 ?). 



Roux, Crust. Medit. t. 29, f. 11, 12. Milne 



Edwards, Crust, iii. p. 129, White, B. M. Cat. 



Brit. Crust, p. G5. Pop. Hist. Brit. Crust. 



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



fig. 247. 

 Oniscus tridens. Scopoli, Ent. Camiolica. Olivier, Enc, Meth. vi. 



p. 26. 

 Idutca Entomon. Pennant, Brit. Zool. 4, pi. 18, f. 5. Leach, Linn. 



Trans, xi p. 304. 



