60 PROCEEDINGS OF THE NATIONAL MUSEUM, vol. 64. 



meriting with this species in the manufacture of sardines; (2) 1, 

 from flesh, dorso-lateral region, 38 fish examined; (3) 1 cyst from 

 viscera, 21 fish examined; (4) 1 cyst from viscera, 35 fish examined; 

 (5) 4 cysts, typical. Dr. C. W. Hahn, to whom I am indebted for 

 these specimens, said that about 1 out of 8 of the silversides which 

 he had been examining for sporozoa, had these cysts in the flesh. 

 The cysts were not numerous, 6 or 7 at most, usually near the tail, 

 and easily seen when the fish is held up to the light. 



Menticirrhus saxatilis. 



Collected in 3 of the years from 1909 to 1912: On 2 dates in 

 July — (1) 4 plerocerci in intestine, evidently introduced with the 

 sand eels in the stomach, 1 fish examined; (2) cysts in intestine, 

 evidently recently introduced with food, sand-eels in stomach, 9 

 fish examined; 1 date in October, 1 plerocersus in intestine, 10 fish 

 examined. 



Merluccius hilineans. 



Collected in 3 of the years from 1907 to 1916: On 3 dates in 

 August — (1) 1 slender, but characteristic cyst, 16 fish examined; (2) 

 1 C3^st on viscera, 5 fish examined; (3) cysts in intestine, probably 

 introduced with young herring, 12 fish examined; 1 date in October, 

 1, typical, in intestine, round herring in stomach, 3 fish examined. 



Microgadus tomcod. 



Collected on 2 dates in July : Few cysts on viscera, 13 fish exam- 

 ined on each date. 



Myoxocephalus aeneus. 



1905, July 28 : 2 small cysts, 1 fish examined. 



Narcacion 7ioMlianus. 



Collected on 1 date in August, 1 cyst, with characteristic plcro- 

 cercus, and larva in spiral valve, evidently recently introduced; 

 1 date in October, 1 cyst with larva; proboscides retracted, but 

 characteristic hooks of the species seen; length of bothrium 0.45, 

 breadth 0.37 ; length of contractile bulb 0.42. 



Palinurichthys perciformis. 



1910, August 20: 1 small cyst on viscera, 1 fish examined. 



Paralichthys dentatus. 



Collected on 2 dates in August — (1) numerous cysts in intestine, 

 lately introduced with food, 2 fish examined; (2) small cysts in 

 stomach wall, associated with O. crenacolle^ 1 fish examined; 1 date 

 in September, 3 plerocererci, recently introduced with food. 



