ART. 21. PARASITES OF SHARKS AND SKATES LINTON. 61 



Pomatamii>s saltatrix. 



Collected on 3 dates in August — (1) 1 cyst from serous coat of 

 intestine, 3 fish examined; (2) 1 plerocercus in intestine, introduced 

 with food, 1 fish on each of 2 dates. 



PoTonotus triacanthus. 



Collected in 5 of the years from 1904 to 1913 : On 3 dates in July — 

 (1) several small, gourd-shaped cysts, clear faint amber yellow, on 

 viscera, 2 fish examined; (2) 1 cyst from viscera, collected by Dr. 

 C. W. Hahn; (3) 1 cyst from viscera, 1 fish examined; 1 date in 

 August, a few small cysts, mostly elongated, cylindrical, 2 fish ex- 

 amined. 



Prionotus carolinus. 



1913, August 3 : A few pleurocerci in intestine, evidently intro- 

 duced with sand eels, with which the stomach was filled. Dr. G. A. 

 MacCallum. 



Pseudopleuronectes americanus. 



1908, August 20 : 1, encysted in flesh, dorso-lateral region. 



1913, December 29 : Encysted on pyloric caeca. 



Raja erinacea. 



1905, August 23: Small, pyriform cyst, evidently recently intro- 

 duced with food; scolex resembles this species; bothria emarginate, 

 length 0.31, breadth about the same ; length of contractile bulbs 0.22, 

 breadth 0.14; diameter of proboscis, excluding hooks, 0.33; only base 

 of proboscis everted, which bore a few slender hooks, longest 0.024. 



1906, July 30: Small white cysts in wall of spiral valve near 

 rectum ; some had degenerated and contained carbonate of lime ; one 

 cyst was found with living larva, the hooks agreeing with this species. 



Raja diaphanes. 



1914, November 4 : 1 cyst in spiral valve, evidently recently intro- 

 duced with food ; sand eels in stomach. 



Roccus lineatus. 



1912, September 11: Typical plerocerci in intestine, evidently in- 

 troduced with sand eels, with which the stomach was filled, 1 fish 

 examined. 



Sarda sarda. 



Collected on 2 dates in August — (1) 1 cyst from viscera, 1 fish 

 examined; (2) cysts in intestine, evidently introduced with sand 

 eels, of which there were 16 in the stomach. 



Scomher scombrus. 



Collected in 4 of the years from 1895 to 1914: On 2 dates in 

 July — (1) few cysts on pyloric caeca, 12 fish examined; (2) a few 



