TREMATODES FROM FISHES LINTON 89 



indistinctly shown in the balsam material, so far as it can be made 

 out it is in close agreement with distomes from Morone americaTUi. 

 The prepharynx is short, the esophagus about as long as the pharynx ; 

 genital pore in front of ventral sucker and a little to the left of the 

 median line ; cirrus smooth ; testes obliquely placed. Ovary circular 

 in outline ; ova two in each, large ; vitellaria extend forward to level 

 of pharynx. Measurements of larger specimen in balsam: Length, 

 0.87 rnm., breadth, 0.39 mm,; diameter of oral sucker, 0.1 mm., of 

 pharynx, 0.045 mm., of ventral sucker, 0.06 mm.; ova, 0.096 by 

 0.066 mm. 



From long-spined sculpin : Five, collected December 22, 1906, Two, 

 collected Maj^ 12, 1913 ; 20 fishes examined. Fourteen, collected April 

 20, 1914; 2 fishes examined. Four (U.S.N.M. No. 8276), collected 

 April 26, 1915; 12 fishes examined. 



The anatomy of these distomes is imperfectly shown mainly on 

 account of the diffuse vitellaria which mask the other genitalia; so 

 far as the anatomy can be made out it is in agreement with that of 

 the distomes from M. americana. They differ in their consistent 

 fusiform shape. The neck was much contracted so that the pharynx 

 and adjacent structures were much obscured. In one a prepharynx 

 could be seen which was about equal in length to the pharynx. Testes 

 oblique ; ovary in front of testes to right of median line. A seminal 

 i-eceptacle was noted in front of the first testis to the left of the 

 ovary ; ova few, large, posterior and dorsal to ventral sucker ; vitelline 

 follicles coarse, extending in front of ventral sucker. Measurements 

 in balsam : Length, 1.4 mm. ; breadth, 0.56 mm. ; diameter of oral 

 sucker, 0.14 mm., of pharynx, 0.07 mm., of ventral sucker, 0.14 mm.; 

 ova, 0.10 by 0.05 mm. 



From kingfish: One (U.S.N.M. No, 8277), collected September 11, 

 1907, Length, life, 1.12 mm.; breadth, 0.77 mm. Measurements, 

 balsam: Length, 1 mm.; breadth, 0,5 mm,; oral sucker, length, 0.12 

 mm., breadth, 0.13 mm.; pharynx, length, 0.06 mm., breadth, 0.05 

 mm.; ventral sucker, length, 0.09 mm., breadth, 0.11 mm.; ova, 0.12 

 by 0.06 mm. This is a small, pyriform distome, densely spinose 

 anteriorly, the spines continuing to near the posterior end. The 

 anatomy is in close agreement with distomes from M. americana,; 

 prepharynx and esophagus short; genital pore near median line; 

 ova few; what was interpreted to be the second seminal vesicle lay 

 on the left side of the ovary, in front of the seminal receptacle, 

 apparently crowded to the right by the ova. 



Small distomes from young kingfish, collected August 21, 1918, are 

 here recorded. 



One (U.S.N.M, No. 8278) from a 55-mm. fish; 3 from a 100-mm. 

 fish; 16 from a 105-mm. fish; 20 from a 110-mm. fish. These are 



