U. S. NATIONAL MUSEUM 



300/-^ 302 



PROCEEDINGS. VOL. 88 PLATE 23 



300. Genarches miiUeri (Levlnsen) from Cyclopterus lumpus: Lateral view, anterior end. 

 301,302. Genarches infirmus, new species, from Oncorhynchus tschazvytscha: 301, Ventral 



view; 302, ova. 

 303, 304. Genarches sp. from Oncorhynchus tschazvytscha: 303, Ventral view; 304, ova_. 

 305-309. Didymozoon scombri Taschenberg from Poronotus triacanthus: 305, Anterior end, 



ventral view; 306, same view of another, ejaculatory duct empty; 307, view of 



region of vicinity of shell gland; 308, anterior end of specimen with metraterm 



gorged with ova; 309, same, more highly magnified. 

 310. Didymozoon sardae (G. A. and W. G. MacCallum) from Sarda sarda: Anterior end. 

 311-314. Didymozoon sp.: 311, Anterior end, life; 312-314, ova. (311 and 312 from Scowz^^^r 



scombrus, 313 from Pneumatophorus grex, 314 from Seriola zonata.) 

 315-317. Wedlia bipartita (Wedl) from Thunnus secundodorsalis: 315, Trematodes encysted 



in pyloric caeca of host, life; 316, small specimen with single head protruding, 



life;'317, specimen compressed, heads of both male and female protruding. 



