TREMATODES FROM FISHES — LINTON 125 



mm. ; diameter oral sucker, 0.18 mm., of pharynx, 0.08 mm., of ventral 

 sucker, 0.15 mm. ; ova, 0.021 by 0.012 mm. 



From pollack: One (U.S.N.M. No. 8334), collected July 31, 1924. 

 Measurements in balsam: Length, appendix retracted, 1.54 mm.; 

 breadth, 0.57 mm. ; diameter of oral sucker, 0.17 mm., of pharynx, 0.08 

 mm., of ventral sucker, 0.13 mm. ; ova, much crowded and collapsed, 

 about 0.018 by 0.012 mm. The prostate appears to begin slightly in 

 front of the ventral sucker, but the neck of the specimen is strongly 

 contracted. If the neck were straightened the anterior prostatic cells 

 would be about on a level with the anterior border of the ventral 

 sucker. 



In the distomes from both the whiting and pollack the seminal 

 vesicle was in two sections, characteristic of the species. 



From codling : One, collected August 19, 1910. 



HEMIURUS species 



Host. — Mousefish {Ilistrio pictus). 



Record of collections. — One (U.S.N.M. No. 8355), immature, col- 

 lected September 5, 1919. Measurements, life: Length, 0.60 mm., 

 breadth, 0.21 mm.; diameter of oral sucker, 0.10 mm., of ventral 

 sucker, 0.14 mm. Cuticle smooth, intestinal rami voluminous, ap- 

 pendix short, retracted. 



Measurements in balsam: Length, 0.84 mm.; breadth, 0.24 mm.; 

 diameter of oral sucker, 0.10 mm., of pharynx, 0.05 mm., of ventral 

 sucker, 0.14 mm. 



Genus BRACHYPHALLUS Odhner, 1905 



BRACHYPHALLUS CRENATUS (Rudolphi) 



PiATE 11, Figures 109-120 



Distomum ocreatum Molin, Linton, Proc. U. S. Nat, Mus., vol. 20, pp. 514, 515 



pi. 42, fig. 12 (from Pomotomtis saltatrix), 1898; in Liuton, Bull. U. S. Fish 



Comm. for 1899, p. 288, figs. 16, 17 (not fig. 19) (from Pollachias virens), 



1900. 

 llemiurus crenatns (Rudolphi), Lander, Coutr. Harvard College, No. 148, pp. 



1-28, 4 pis., 1904. 

 Brachypallus crenatns (Rudolphi), Odhneij, Die Trematoden des arktischen 



Gebietes, Fauna Arctica, pp. 352, 353, pi. 4, figs. 3-5, 1905. — Looss, Zool. 



Jahrb., vol. 26, pp. 158, 159, figs. 64, 65, 1907.— Manter, Journ. Parasit., vol. 



12, p. 13, 1925 ; Hlinois Biol. Mon., vol. 10, No. 2, pp. 94, 95, fig. 53, 1926. 

 Brachypliallus afflnis (=-B. crenatns C. H. Lander, 1904) Looss, Zool. Jahrb., 



vol. 26, pp. 158, 159, 1907. 



The distomes referred to this species in this report are characterized 

 by having a nearly linear body which is crossed by fine lines pro- 

 ducing sharply serrate margins in robust specimens; in many cases 



