Worm Parasites 63 



Two of the rock bass examined contained Nematodes, belonging 

 to two species. In one of them, three slender worms measuring each 

 aibout 30 mm. in length were taken from the hinder portion of 

 the rectum. These worms possess the oral armature which char- 

 acterizes the genus Camallanus and are to be referred to the species 

 C. oxycephalus (Ward and Magath). They were all females and 

 the uterus contained young worms. The blood of this species is 

 bright red and surges regularly between the two ends of the body, 

 the blood-wave passing from the anterior to the posterior end and 

 back again about six times in a minute. 



The intestines of another fish contained five specimens of another 

 species of Nematode, the largest of which was about 20 mm. long 

 and the smallest about half that length. They belong to the family 

 Cucullanidae and are to be referred to the genus Dactinoides. A 

 species of this genus has been described from the perch and the wall- 

 eyed pike in Lake St. Clair and also has been found in the perch in 

 Oneida Lake. 



The intestine of one of the rock bass examined contained nine 

 Acanthocephala (Vial 79). The worms ranged from 6 to 12 mm. in 

 length and belong to the genus Echinorhynchus, a genus containing 

 many species parasitic in fresh-water fish. 



No Cestodes were taken in the rock bass examined. 



Ameiurus natalis (Le Sueur) : Yellow Bullhead. Three fish (No. 

 1240, * 1 247 A) were examined and but few parasitic worms were 

 found, although all the fish were infected. In the intestines of one 

 bullhead two Cestodes belonging to the genus Corallobothrium were 

 obtained, and in the livers of two of them numerous cysts of an unde- 

 termined species of Cestode. In the intestines of two also were 

 found a few small Nematodes about 5 mm. long belonging to the 

 genus Ciicullanus, while in the intestines of two fish two Acantho- 

 cephala (Vial No. 15) of the genus Echinorhynchus were taken. 

 No Trematodes were present. 



Ameiurus nebulosus (Le Sueur) : Common Bullhead. Six fish 

 (Nos. 1205b, 1213, 1217) werel examined, all of which were infected 

 with parasitic worms, two of them heavily. Two of the fish con- 

 tained Nematodes, three contained Acanthocephala, four contained 

 Cestodes and three contained Trematodes. 



Six specimens of a single species of Nematode were taken from 

 two bullheads. They were small slender worms about 5 mm. in 

 length which belong to the genus Spinitectus. Worms belonging to 

 this genus have also been taken from the perch, the carp and the 

 common sunfish in Oneida Lake. But one species has been described 

 as yet in America. 



The Cestodes from the bullhead belong to two species. From the 

 middle of the intestines of one fish many small worms belonging to 

 the genus Corallobothrium were obtained, being probably the same 

 species as that taken from the yellow bullhead. But one record 



* Determination doubtful. 



