8 



PROCEEDINGS OF THE NATION" AL MUSEUM 



VOL. 77 



scription or in studying his figures.^ In fact, the females of Trape- 

 sicepon and Apocepon can only be separated in such minor points as 

 the frontal lamina of the cephalon — which is large with Trapesicepon 



'. boss. 



'.be 



e-up.boss 



Figures 17-19. — Apocepon pdlcheEj female, 17, dorsal view ; 18, ventbal 



VIEW OF abdomen WITHOUT PLEURAL LAMELLAE^ EXOPODS, AND UEOPODS ; 19, 

 UROPODS 



and absent with Apocepon; the length of the exopods of the peo- 

 pods — ^longer with Apocepon than with Trapezicepon; and the habi- 



2 Journ. Acad. Nat. Sci. Phila., ser. 2, vol. 3, 1855, p. 150, pi. 11, figs. 26-32, quoted in 

 H. Richardson, A Monograph on the Isopods of North America, Bull. 56, U. S. Nat. Mus., 

 Washington, 1905, p. 511 



