ART. 21. PARASITES OF SHARKS AND SKATES LINTON. 71 



Myoxocephalus aeneus. 



1906, January 3 : 1 pyriform cyst, 50 fish examined. 



Osmerus riiordax. 



Collected in 3 of the years fi-om 1903 to 1909, inclusive : Cysts on 

 viscera; on 5 dates in August, 2 to 6 cysts on each date, 81 fish ex- 

 amined; 2 dates in October, 2 cysts on each date, 41 fish examined; 

 2 dates in November, 1 cyst on each date, 41 fish examined. 



Palinurichthijs perciformis. 



1912, September 19 : 2 plerocerci, 35 fish examined. 



Paralichthys dentatus. 



1903, October 19 : 1 cyst from stomach wall, 1 fish examined. 



1906, August 16: 1 cyst, 1 fish examined. November 9: 1 cyst, 

 1 fish examined. 



Paralichthys ohlongus. 



1912, June 7: 7 pyriform cysts, 6 by 3 mm., some of them with 

 long pedicels. 



Pollachias virens. 



Collected in 6 of the years from 1903 to 1914, inclusive : Cysts of 

 various shapes, but usually pyriform, 2.5 to 6 mm. in length; on 

 viscera, most numerous on pyloric caeca. On 1 date in May, 1 cyst, 

 8 fish examined ; 3 dates in June, 1 to many cysts, 21 fish examined ; 

 9, dates in July, many on each date, 21 fish examined; 2 dates in 

 October, 1 to 30, 2 fish examined. Typical record : June 30. Cysts 

 in practically all of the 14 fish examined, mostly under the serous 

 coat of the pyloric caeca ; a small number under the caeca next the 

 stomach wall ; a few in the stomach wall ; elliptical and pyriform. 



Pomolohus pseudoharengus. 



Collected in 6 of the years from 1907 to 1915, inclusive : On 1 date 

 in April, 1 cyst, 2 fish examined ; 2 dates in May ; on one date, 1 cyst, 

 40 fish examined, on the other, few cysts, one 8 by 4 mm., 6 fish ex- 

 amined ; 3 dates in June, 1 to 7 cysts, some pyriform, about 5 mm. in 

 length, 19 fish examined; 2 dates in July, 1 cyst from testis of one 

 fish, few from 2 fish; 1 date in August, 20 or more encysted on vis- 

 cera of 3 fish, not noted in others, but about 10 found in dish in which 

 viscera of 10 other fish had been lying ; most of cysts pyriform, and 

 about 4 mm. in length. 



Poronotus triacanthus. 



Collected in the years 1903, 1910, and 1911 : On 1 date in June, 2 

 cysts from 1 fish; 3 dates in July, few cysts on viscera, on one of 

 the dates found mostly on the pyloric caeca, 33 fish examined ; cysts 

 found in but few of the fish. On one of the dates a scolex was noted 

 which came from a cyst resembling a form common in R. hulhifer. 



20183— 25— Proe.N.M.vol.64 ■ 33 



