U. S. NATIONAL MUSEUM 



PROCEEDINGS. VOL. 88 PLATE 7 



58-64. Bianium plicilum (Linton): From Sphoeroides maculotus: 58, Degenerate specimen, 

 vltellaria much reduced, ova few and imperfect; 59, posterior end, frontal section, 

 vitellaria sparse; 59a, posterior end, frontal section, slanting, vitcllaria sparse; 60, 

 horizontal section, anterior end; 61, transverse section, anterior end; 62, trans- 

 verse section at level of posterior border of ovary, testis added from next posterior 

 section; 63, transverse section near level of anterior end of first testis; 64, trans- 

 verse section at level of first testis showing excretory vessel. 



65-67. Homalometron pallidum Stafford: 65, From Mentictrrhus saxatilis; 66, short variety 

 from same host; 67, ovary and testes from three specimens from Pseudopleuro- 

 nectes americanus. 



