U. S. NATIONAL MUSEUM 



PROCEEDINGS. VOL.. 18 PLATE 4 



19 



29-31. Stephanostomum sp. from Seriola lalandi: 29, Dorsal view, spines evanescent; 30, 

 anterior end of another specimen, ventral view; 31, optical section of tissues ot 



32-34. Suphanostomum tenue (Linton): 32, From Hemitripterus americanus, ventral view; 



33, front view of oral spines; 34, from Amviodyles americanus, dorsal view. 

 3S. Himasthlatensa, new species: From Gadus morrhua. 

 36,37. Lepidapedon clavatum, new species: 36, From Lophopsetta maculata; 37, from Ura- 



tacanthus schoepfi. 



