64 Roosevelt Wild Life Bulletin 



has heretofore been made in this country of this genus, and 

 that was in Wisconsin where it also occurred in the common bullhead. 

 In the liver of three fish were found numerous encysted plero- 

 cercoids belonging to some species of tapeworm of the genus Pro- 

 teocephalus. 



Two species of minute Trematodes were taken in the bullhead. 

 In the stomach of three fish many individuals about half a millimeter 

 in length were found that belong to an tindescribed genus allied to 

 Plagiorchus. In the intestine of one fish also were obtained many 

 slender Trematodes about one millimeter in length, compressed and 

 mounted, belonging to an undescribed genus allied to AUocreadinm. 



Three of the six bullheads examined contained a few Acanthoce- 

 phala (Vial 15) belonging to the genus Echinorhynchus. 



Angiiilla rostrata (Le Sueur) : Eel. Two eels (Nos. I2i6e, 1251) 

 were examined, and also the viscera from about forty others which 

 were obtained from a fish dealer in Brewerton. They were found to be 

 extensively infected with parasitic worms — Cestodes, Trematodes, 

 Nematodes and Acanthocephala being all represented. Half of the 

 viscera contained Cestodes belonging to two different species. The 

 most numerous species was a tapeworm belonging to the genus Pro- 

 teocephahis, and probably to the species P. iiiacrocephalus (Creplin), 

 the length of which was about 200 mm. In most cases but one or 

 two worms were taken from a single intestine, but in two cases the 

 intestine contained a large number of the worms. The other Cestode 

 was also a species of the genus Proteocephalus, but much, smaller 

 than the one just mentioned. It is a slender worm, measuring from 

 10 to 15 mm. in length, ten individuals of which were taken from 

 the intestine of a single eel. This genus of tapeworm contains many 

 species common in fresh-water fishes. 



Two species of Trematode were taken. In the stomachs of about 

 three-fourths of the fish examined from one to three large distomes 

 belonging to the genus Azygia were found. One fish harbored four- 

 teen in its stomach. The worms measured from 18 to 25 mm. in 

 length, compressed and preserved. Species of this genus are com- 

 mon in fresh-water fish and have been taken also in the chain 

 pickerel and the wall-eyed pike in Oneida Lake. Another species 

 of Trematode, belonging to the genus Crepidastomum, was found in 

 the intestine of a single eel, nine individuals being taken. The 

 length of the worms was 2 mm., preserved. 



But few Nematodes were taken, and these were all of one species. 

 This was a slender worm about 10 mm. in length belonging to the 

 genus Ascaris, which was found in small numbers in the intestines 

 of a few eels. The male of this species has two pairs of postanal 

 papillae. 



The Acanthocephala were better represented. A single species 

 belonging to the genus Acanthocephalus and measuring from 5 to 

 10 mm. in length was obtained in several intestines. 



