U. S. NATIONAL MUSEUM 



PROCEEDINGS. VOL. 88 PLATE 19 



252,253. Nannoenterum baculum (Linton) from Sphyraena borealis: 252, Anterior end, 

 showing circle of 20 spines; 253, muscle fibers in body wall, glycerin. 



2:>4-256. Xannoenterum gorgon (Linton) from Seriola lalandi: 254, Dorsal view of anterior 

 end; 255, dorsal view of another specimen; 256, ova. 



257-259. Stichocotyle nepkropis Cunningham from Raja laevis: 257, Ventral view of anterior 

 end; 258, region of fifth to some distance back of sixth ventral sucker; 259, ovum. 



260-265. Steringophorus furciger (Olsson) from Pseudopleuronectes americanus: 260, Ventral 

 view; 261, 262, cross sections at level of cirrus pouch; 263, 264, cross sections at 

 level of Laurer's canal, from different series of sections; 265, cross section near 

 end of intestine. 



