ART. 21. PARASITES OF SHARKS AND SKATES LINTON. 101 



Eippoglossus hippoglossus. 



1906, June 14 : Few, 7 fish examined. 



Lagodon rhomboides. 



1914, June 4: 31 in 1 fish, 19 in 1 fish; length 2 mm., 2 fish 

 examined. 



LeiostoTYius xanthunis. 



1912, October 18: 1, length 1.9; diameter of head 0.33, 6 fish 

 examined. 



Leptocephalus conger. 



1903, August 24 : Small, number not noted, 1 fish examined. 



Lophius piscator-ius. 



Collected in 15 of the years from 1899 to 1920: Usually present 

 in enormous numbers among the villi of the intestine, in most cases 

 from 1 mm., or less to 5 mm. in length; in a few instances the 

 length was as much as 11 mm. ; red pigment noted on but one date, 

 but most of the material had been in formalin before it was exam- 

 ined. On 1 date in May, numerous, 2 fish examined ; 1 date in June, 

 very numerous, 0.9 to 2.25 mm. in length, 1 fish examined; 5 dates 

 in July, few to very numerous, 9 fish examined. On July 9, 1912, 

 my attention was called by Dr. G. A. MacCallum to small cestodes 

 which appeared to have developed proglottides. This appearance 

 was due to somewhat regular constrictions of the body wall, but 

 there was no indication of the beginning of proglottides. The 

 bothria were rather thick margined with strong acetabula. Struc- 

 tures which appeared to be rudiments of hooks were noted ; terminal 

 sucker very small. On 6 dates in August, few on 1 date, very nu- 

 merous on others, 9 fish examined; 3 dates in September, many, 3 

 fish examined; 6 dates in October, many to very numerous, 7 fish 

 examined. Record for October 10, 1904: Very numerous, shorter 

 ones about 1 mm. in length, longer, without intermediaate forms, 

 6 mm., or more, in length; bothria with well-defined, Monorygma- 

 like auxiliary sucker. October 13, 1905: Very numerous, maximum 

 length 6.5 mm.; pseudo-segments present; bothria suggest Echenei- 

 hothrium or Acanthohothriuni. On 5 dates in November, many to 

 very numerous, 6 fish examined; 2 dates in December, few on one 

 date, numerous on the other, 4 fish examined. 



(U.S.N.M., Helm. Coll. 7730.) 



Melanogrammvs aeglefinns. 

 1906, May 7 : Few. 



Menticirrhus saxatilis. 



Collections made in 1903 and 1910 : On 1 date in July, 2 from gall- 

 bladder, 2 red pigment patches, collected by Dr. C. W. Hahn; 

 2 dates in August — (1) very small, number not recorded, 4 fish ex- 



