U. S. NATIONAL MUSEUM 



PROCEEDINGS, VOL. 88 PLATE 21 



272., 



272-274. Lecithostaphylus nitens (Linton) from Tylosurus acus: 272, Frontal section, anterior 

 end; 273, frontal section, region of ovary and testes; 274, ova. 



275-277. Zoogonoides laevis, new species, from Tautoga onitis: VS, \tv\lxa\ view; 276, 

 cirrus pouch and metraterm, ventral view, life, ova with ciliated miracidia; 277, 

 excretory pore, life. 



278-282. Steganoder'ma formosum Stafford: 278, Ventral view; 279, ovum; 280, ventral 

 view; 281, ova; 282, spines on ventral surface. (278 and 279 from Paralichihys 

 oblongus, 280-282 from Acanthocottus octodecimspinosus.) 



283. Deropristis uiflata (Molin) from Anguilla rostrata: \'entral view. 



284. Deropristis hispida (Abilgaard) from Acipenser slurio: Dorsal view of anterior end. 



