68 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. (54. 



Clupea harengus. 



1904, November 12 : 1 cyst, 3 fish examined. 



Gadus callarius. 



Collections made in 10 of the years from 1903 to 1915, inclusive: 

 Cysts many, with brown, waxy degenerate tissue, from serous coat 

 of viscera and mesentery, mostly pyriform, some oval-elliptical, 

 sometimes pedicelled, occasionally in clusters, about 5 mm. in great- 

 est diameter. On 9 dates in January, 1 to 20 cysts on each date, 

 126 fish examined; 2 dates in May, 1 to 24 cysts on each date, 3 

 fish examined; 6 dates in November, 1 to 24 cysts on each date, 29 

 fish examined; 19 dates in December, 1 to 50 cysts on each date, 

 297 fish examined. 



Hemitriptei'us americanus. 



1904, December 9: 1 pyriform cyst, with some dark pigment, 1 

 fish examined. 



1907, November 5 : 18, encysted in piece of intestine 8,5 centimeters 

 in length ; much black pigment. 



1911, November 27: Pyriform cysts of various sizes and shapes, 

 about 5 by 2 mm., 4 fish examined. 



1913, February 18 : 2 cysts, 5 fish examined. 



1914, January 10: 50 or more cysts, oval with dark brown pig- 

 ment, and degenerate tissue, 2 to 3 mm. in diameter and of variable 

 length, 6 fish examined. 



Leiostoiwus xanthurus. 



1913, September 29 : 1, 3 fish examined. 



Leptocephahis conger. 



1903, August 24: Small oval cysts free in the intestine; evidently 

 recently introduced with food (scup in stomach), number of fish 

 examined 1. 



1904, July 22: 1 scolex; evidently recently introduced with food, 

 number of fish examined 1. 



Lophius piscatorius. 



Collections made in 13 of the years from 1899 to 1920, inclusive : 

 In general the encysted stage of this species in the goosefish is 

 represented by globular and pyriform cysts, few to many on the 

 viscera. These cysts are often tense, translucent, often predicelled, 

 3 to 13 mm. in diameter, some with degenerate tissue, larger. On 1 

 date in May, 2 large, pyriform, pedicelled cysts, 11 by 6.5, and 13 

 by 7 ; larger end of the cj'sts translucent, and filled with fluid, larva 

 at smaller end with some degenerate tissue, 10 fish examined. On 

 1 date in June, cysts on viscera. On 5 dates in July, Record 

 for July 29, 1910: Numerous pyriform cysts on stomach, intestine 

 and mesentery, and embedded in walls of intestine of each of 4 



