70 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 04. 



Melanogrammus aegelflnus. 

 1895, October 31 : 1 cyst.. 



1903, September 3 : 1 cyst on viscera, 5 fish examined. 

 1906, May 7 : 1 cyst, 1 fish examined. 



1909, August 12 : 36 collected, more could have been got, encysted 

 on intestine, 16 fish examined. 



1913, April 29 : Encysted on, and in intestinal wall ; 139 cysts were 

 counted on a piece of intestine 35 mm. in length. 



Menidia notata. 



1906, August 25 : 2 from large number of fish, brought to me by 

 Dr. I. A. Field, who was experimenting with these fish in the manu- 

 facture of sardines. 



1910, August 30 : 1 cyst, 24 fish examined. 



Menticirrhus saxatilis. 



1909, September 8: 1 scolex, evidently recently introduced with 

 the food. 



Merluccius hilinearis. 



Collected in 12 of the years from 1894 to 1914, inclusive: Cysts 

 often in large nmnbers, on viscera, in mesentery, and in intestinal 

 wall, usually pyriform, often with dark brown pigment, in many 

 cases associated with immature mematodes ; of varying sizes, but usu- 

 ally about 5 mm. in greatest diameter. A typical record is that of 

 August 19, 1910 : Numerous cysts on intestine and liver, and in in- 

 testinal wall, 6 fish examined. These cysts associated with imma- 

 ture nematodes, have usually been present on the viscera of whiting 

 which I have examined. It was noted that these cysts and the con- 

 tained scoleces agi*ee with those recorded as Rhynchohothrium, 

 species (1901, p. 474, figs. 251-254). On 3 dates in May, 1 to 9 cysts 

 on each date, 17 fish examined; 1 date in June, few cysts, 1 fish ex- 

 amined ; 8 dates in August, 1 on one date, many on others, 57 fish ex- 

 amined ; 9 dates in October, 1 to numerous on each date, 103 fish ex- 

 amined; 17 dates in November, few to numerous, 144 fish examined. 



Microgadus toincod. 



Collected in 5 of the years from 1904 to 1914, inclusive : Cysts on 

 viscera. On 1 date in July, 1 cyst, 13 fish examined; 1 date in 

 August, 1 cyst. 9 fish examined ; 2 dates in October, 1 scolex, 12 fish 

 examined. 



1923, July 22: A few black-pigmented cysts on stomach walls of 

 2 fish. 



Morons americana. 



1906, August 8: 2 irregularly oval cysts, brownish yellow, 6 fish 

 examined. 



