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PROCEEDINGS OF THE NATIONAL MUSEUM 



VOL. 88 



form, the other rather slender and pointed posteriorly, each with 

 characteristic ventral sucker. Seventeen (U.S.N.M. No. 8262), col- 

 lected October 23, 1913; length, 1.5 mm., to 2.75 mm. in formalin. 

 One, collected May 4, 1914; length, 3 imn. Fifteen, collected October 

 10, 1916 ; longest about 2.5 mm. in formalin. 



Table 19. — Measurements of three distomes of Cymbephallus vitellosus from 

 the tautoff, showing diversity of proportions 



Measurement 12 3 



Mm. Mm. Mm. 



Length 0.87 1.15 2.87 



Diameter at anterior end .- - -07 .11 .18 



Diameter at middle -22 .43 .60 



Diameter near posterior end - .08 .34 .30 



From cunner : Bull. U. S. Fish Comm. for 1899, p. 462, 1901. Three, 

 collected August 15, 1905, small. One, collected August 22, 1905, 

 length, 1.23 mm. in balsam. Seven (U.S.N.M. No. 8263), collected 

 July 17, 1919 ; length, 1.5 mm. to 2.8 mm. in balsam. The vitellaria 

 in the distomes of this lot are less dense than usual for this species, 

 and the intestines could be traced to the posterior end. The metra- 

 term could be seen opening in front of the genital sucker. Measure- 

 ments in balsam: Length, 2.80 mm., breadth, 0.52 mm.; oral sucker, 

 length, 0.16 mm., breadth, 0.15 mm.; pharynx, length, 0.15 mm., 

 breadth, 0.12 mm.; ventral sucker, length, 0.28 mm., breadth, 0.25 

 mm. ; ova, 0.048 by 0.027 mm. 



From round pampano: Three (U.S.N.M. No. 8264), collected Sep- 

 tember 2, 1903, from a 20-mm. fish. Small, less than 1 mm. in length, 

 strongly contracted; average length, 0.92 mm., breadth, 0.44 mm.; 

 vitellaria to middle of ventral sucker ; prominent border around ven- 

 tral sucker. Measurements in balsam: Length, 0.91 mm., breadth, 

 0.50 mm.; oral sucker, length, 0.13 mm., breadth, 0.15 mm.; pharynx, 

 length, 0.12 mm., breadth, 0.15 mm. ; ventral sucker, length, 0.17 mm., 

 breadth, 0.24 mm. ; ova, 0.048 by 0.030 mm. 



From goggler: Five (U.S.N.M. No. 8265), collected August 29, 

 1913; length, 3.38 mm., breadth, 0.30 mm., life. Measurements in 

 balsam: Length, 2.66 mm., breadth, 0.42 mm.; diameter oral sucker, 

 0.15 mm., of pharynx, 0.10 mm., of ventral sucker, 0.18 mm. ; ova, 0.054 

 by 0.027 mm. One, collected September 17, 1914; length, 2.17 mm. in 

 formalin. Metraterm seen opening about on level of posterior end 

 of pharynx and in front of the genital sucker; seminal vesicle to 

 about one third the distance from ventral sucker to ovary ; papillae 

 around ventral sucker. 



