BOPYRlDiE. 



ISOPODA. 

 NORMALLY. 



'225 

 BOPYRTDjE. 



GYGE GALATHEiE. 



Male. — Ceplialon roundish, near'y as broad as tlie tirst segment of the 

 pereion. Pereion increasing in breadth posteriorly. Pleon decreasing in 

 breadth posteriorly, last segment bifurcate. First pair of antenna3 short, 

 three-jointed ; second pair about three times the length of the su]3erior, and 

 terminating in a small flagellum. 



Female. — Flat, oval, slightly unsymmetrical. Cephalon broad, pleon short 

 and continuous with the pereion, terminal segment having a pair of pleo- 

 poda (posterior pair) projecting beyond its extremity and giving a bifurcate 

 appearance to the posterior margin. Antennag rudimentary. Branchial 

 appendages consisting of small sacs near the margin of the ventral surface 

 of each segment of the pleon. 



Length of the male, three-twentieths of an inch. 

 ,, ,, female, eight-twentieths ,, 



The male gradually increases in breadth from the head 

 to the last segment of the body (pereion), from which the 

 segments of the tail rapidly decrease, thus giving the 

 general aspect of a long narrow animal, with a large round 



VOL. II. Q 



