U. S. NATIONAL MUSEUM 



10 . .... 



PROCEEDINGS. VOL. 90 PLATE 61 



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9, 10. Bothnoceplialus scorpii (Miiller): 9, Scolex (from Hippoglossus platessoides); 10. ripe 



segments (from Paralichthys de7itatus). 

 11-13. Bothriocephalus claviceps (Goeze): 11, Scolex and first segments (from Limanda 



ferruginea); 12, scolex and first segments (from Pseudopleuronectes aniericanus); 



13, posterior end of strobila (there are no ova in the penultimate segment) (from 



Cyclopterus lumpus). 

 14. Bothriocephalus sp.: Plerocercus (from Tautogolabrus adspersus). 

 15-18. Cleslobothrium crassiceps (Rudolph!) : 15, Scolex with young strobila (from Mer- 



luccius bilinearis); 16, proglottis, testes median, nearly hidden by vitellaria (from 



M. bilinearis); 17, scolex and anterior end of strobila (from Lophius piscatorius); 



18, posterior segments (from L. piscatorius). 



