88 PROCEEDINGS OF THE NATIONAL MUSEUM vol.88 



short vas deferens, as in other species of this genus; testes two, one 

 following the other, nearly contiguous, at about the posterior fourth 

 of the length; ovary lobed, in front of first testis, a little to right of 

 median line ; seminal receptacle between ovary and first testis ; uterus 

 in front of ovary; metraterm thick-walled, on left side of cirrus 

 pouch ; vitellaria diffuse, from posterior end nearly to ventral sucker. 



Tyye specimens. — Holotype, U.S.N.M. No. 8273; paratypes. No. 

 8274. 



Host. — Chub mackerel {Pneumatophorus grex). 



Record of coUectiom.— One (U.S.N.M. No. 8273), collected July 

 31, 1928. Measurements in balsam: Length, 2.38 mm., breadth, 0.59 

 mm. ; diameter of oral sucker, about 0.08 mm., of pharynx, 0.06 mm., 

 of ventral sucker, 0.15 mm. ; length of prepharynx, 0.17 mm., of esoph- 

 agus, 0.06 mm. ; ova, 0.06 by 0.03 mm. 



Four (U.S.N.M. No. 8274), collected August 29, 1928. Measure- 

 ments in balsam : Length, 1.12 mm., breadth, 0.35 mm. ; diameter of 

 oral sucker, about 0.09 mm., of pharynx, 0.03 mm., of ventral sucker, 

 0.12 mm. ; ova, 0.054 by 0.030 mm. 



LEPOCREADIUM TRULLAFORME. new species 



Pl.\te 6, Figures 53-56 



Distomum areolatum Rudolphi, Linton, Bull. U. S. Fish Comm. for 1S99, pp. 

 279, 293, 294, figs. 60-63, 1900; ibid., pp. 456, 462, 4S6, 487, fig. 351, 1901. 



Small distomes, more or less oval in outline, densely spinose ante- 

 riorly; oral and ventral suckers about equal; prepharynx and esoph- 

 agus present, but, so far as observed, not exceeding the pharynx 

 in length; intestines extend nearly to posterior end; genital pore in 

 front of ventral sucker a little to left of median line; cirrus pouch 

 extending back of ventral sucker, enclosing the prostate and a 

 seminal vesicle, followed by a second seminal vesicle ; testes two, near 

 together, at about posterior third, obliquely placed. Ovary, in some 

 cases slightly lobed, to right of median line in front of second testis ; 

 seminal receptacle in front of first testis and on the left of the ovarj'^ ; 

 uterus between testes and ventral sucker, ova few and large ; metra- 

 term to left of cirrus pouch ; vitellaria diffuse, extending in front of 

 ventral sucker. 



Type specimens. — U. S. N. M. No. 8276 (holotype and paratypes). 



Hosts. — ^American sole {Achirus fasciatus')., long-spined sculpin 

 {Acanthocottus octodeciTnspinosus) , kingfish {Menticin^hus saxatilis) , 

 white perch {Morone am^ericana) ^ winter flounder {Pseudopleuro- 

 nectes americanus') .^ cunner {Tautogolabrus adspersus). 



Record of collections. — Distonumn sp.. Bull. U. S. Fish Comm. for 

 1899, p. 487, fig. 351, 1901. Two (U.S.N.M. No. 8275) from Ameri- 

 can sole, collected October 14, 1915. Wliile the anatomy is rather 



