Worm Parasites 65 



Cyprinns carpio (Linn.) : Carp. Three fish (Nos. 1205c, I2i6g) 

 were examined, but one of which was found to be infected with 

 internal parasites. In this fish four Nematodes belonging to the genus 

 Spinitectus were taken. Cestodes, Trematodes and Acanthocephala 

 were not found. 



Esox reticulatus (Le Sueur) : Chain Pickerel. Four fish (No. 

 1233b) were examined and but few parasitic worms were found. One 

 fish was entirely free from them. In two fish many small Cestodes 

 belonging to the family ProteocephaHdae were found in the intestine 

 and in one fish in the rectum, the worms being present in small 

 numbers and all belonging to the same species. 



In the stomach of each of two fish was found a single Trematode, 

 both belonging to the genus Azygia but to two different species. One 

 of these is a long slender worm with parallel sides and 20 mm. long 

 by 1.25 mm. wide, compressed and preserved; the other is more or 

 less lenticular in shape and 4 mm. long by 8 mm. wide, also com- 

 pressed and preserved. 



In the intestine of one fish a small number of two species of small 

 Acanthocephala (Vial 99) were found. One of these species belongs 

 to the genus N eoechinorhynchus and is about 5 mm. in length ; the 

 other species belongs to the genus Acanthocephalus and has a length 

 of about 6 mm. 



No Nematodes were taken in the chain pickerel. 



Eupomotis gibbosus (Linn.) : Common Sunfish. Five sunfish (Nos. 

 1233d, 1247c) were examined. One of these fish was infected with 

 cysts of the Trematode CUnostonnwm marginatum (Rudolphi), which 

 was also found in the perch in Oneida Lake, two cysts occuring on 

 the gills and seven at the base of the tail. In the stomach of one fish 

 were found several slender Nematodes about 12 mm. in length belong- 

 ing to the genus Spinitectus. Worms belonging to this genus were 

 also found in the common bullhead, the carp and the perch in Oneida 

 Lake. In the livers of three sunfish were found a small number of 

 large cysts containing immature Cestodes of undetermined affinities. 

 No Acanthocephala were taken. 



Lepomis incisor (Cuv. and Val.) : Bluegill. Two fish (No. 1205) 

 were examined and the only parasites taken were encysted Trema- 

 todes belonging to the genus Hemistomum, which were found in 

 the livers of their hosts. When taken from their cysts and ex- 

 tended the worms measured about 1.5 mm. in length. The livers 

 of the fish were quite filled with them. The bluegill is the inter- 

 mediate host of these worms, the adult host being some species of 

 gull or other fish-eating bird. 



Micropterus salmoides (Lacepede) : Large-mouthed Black Bass. 

 One fish (No. 1247G) was examined and only Acanthocephala and 

 Trematodes were discovered. Belonging to the first group were a 

 small number of worms of the genus N eoechinorhynchus (Vial 120), 

 about 5 mm. in length, which were taken in the intestine. Belonging 



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