68 Roosevelt Wild Life Bulletin 



ing from thirteen to twenty-four. The length of the worms ranged 

 from 4 to 10 mm. This Trematode also occurs in cysts under the 

 skin of the perch and sunfish, as already set forth in this report, 

 these fish acting as the intermediate host of the worm. The heron 

 is its final host and harbors the mature, egg-laying worms, which 

 it acquires by feeding on the fish. The eggs of the parasite, falling 

 into the water with the excrement of the bird, give rise to the 

 young worms, which make their way by some unknown means into 

 the fish, and their Hfe-cycle is thus completed. 



The second species of Trematode taken was a minute holostome 

 belonging to the genus Strigea. Numerous specimens of this worm, 

 which measured about one millimeter in length, were found in the 

 intestine of one of the birds examined. Another species of this 

 genus was also taken in the herring gull on Oneida Lake. 



Of the two species of Cestodes taken in the heron one was a very 

 small worm, measuring lo to 15 mm. in length, which was found in 

 large numbers in the duodenum of one of the birds. It belongs to 

 the genus Hymenolepis, a genus which contains many species of small 

 tapeworms parasitic in water birds. The other species was repre- 

 sented by a single specimen, 120 mm. in length, taken from the 

 intestine, and belonging to the family Tetrabothridae. 



Ardea virescens (Linn.) : Green Heron. Two birds were examined. 

 Clinostomiim and Strigea, both of which were found in large num- 

 bers in the great blue heron, were not found. One Cestode belong- 

 ing to the same species in the family Tetrabothridae as that taken 

 in the great blue heron was obtained in the intestine. Several Nema- 

 todes belonging to the genus Ascaris were taken in the intestine of 

 one of the birds. No Trematodes or Acanthocephala were found. 



Ceryle ale yon (Linn.) : Kingfisher. Two birds were examined 

 and no internal parasites were taken in either. 



Larus argentatits Briinnich: Herring Gull. Two young birds 

 were examined and the rectum and cloacal bursa of one of them was 

 found to be infected with a holostomid Trematode of the genus 

 Strigea. The length of the worms varied from 2 to 8 mm. and about 

 twenty were present. Another species of the same genus was also 

 taken from the intestine of the great blue heron. The larvae 

 of these worms are known as tetracotyle forms and have been found 

 in the liver of Lyiiinaea catascoplum Say and L. emarglnata Say in 

 Oneida Lake. It is not likely that the gulls are infected with these 

 parasites by eating the snails but rather that some small snail-eating 

 fish upon which the gulls feed acts as the intermediate host of the 

 worm. No Cestodes, Nematodes or Acanthocephala were found 

 in the herring gulls examined. 



Chrysemys marginata (Agassiz) : Painted Turtle. Four large 

 turtles were examined, in only one of which parasitic worms were 

 found. The stomach of one turtle contained a tangled mass of 

 Nematode worms averaging 25 mm. in length, belonging to the genus 



