TREMATODES FROM EISHES — LINTON 137 



lobes at posterior border of ovary. The lobes of the vitellaria ap- 

 peared to be distinct from each other, but were closely crowded to- 

 gether. Their exact number could not be determined, but there 

 appeared to be about six of them. The uterus, filled with small ova, 

 occupies most of the postacetabular region. The ova in three of 

 the mounted specimens agree in size, the maximmn dimensions be- 

 ing about 0.024 by 0.012 mm. to 0.030 by 0.016 mm. In one of the 

 specimens the ova are smaller and somewhat irregular in shape, as 

 if defective, maximum about 0.015 by 0.010 mm. 



Measurements, life: Length, 1.36 mm.; breadth, 0.40 mm.; di- 

 ameter oral sucker, 0.10 mm., pharynx, 0.06 mm., ventral sucker, 

 0.20 mm. ; ova, 0.034 by 0.017 mm. 



Measurements in balsam: Length, 1.12 mm.; breadth, 0.25 mm.; 

 diameter oral sucker, 0.09 mm., pharynx, 0.054 mm., ventral sucker, 

 0.16 mm.; ova, 0.030 by 0.016 mm. (U.S.N.M. No. 8365.) 



Subfamily Dinurinae Loess, 1907 



Genus DINURUS Looss, 1907 



DINURUS PINGUIS, new species 



Plate 9; Plate 10, Figures 97-100 



Distomum grandlporum Rudolphi, Linton, Proc. U. S. Nat. Mus., vol. 20, pp. 

 520, 521, pi. 44, fig. 9 (from Anguilla rostrata), 189S. 



Distomum rufoviride Rudolphi, ihid., pp. 512-517, pi. 42, fig. 14, pi. 43, figs. 

 1^ (from Roccus Uneatus), 1898. 



Distomum tomatum Rudolphi, Linton, Bull. U. S. Fish Comm. for 1899, p. 

 442 (from Fundulus heteroclitus) , p. 444, fig. 310 (from Menidia notata), 

 p. 455 (from Roccus Uneatus), 1901; Bull. U. S. Bur. Fish., vol. 24, p. 355 

 (from Synodus foetens), p. 356 (from Tylosurus marinus), p. 399, fig. 156 

 (from Menticirrhus americanus), 1905. 



The genus Dlnurus was established by Looss in 1907 with D. 

 tomatus (Rudolphi) as the type species (Zool. Jahrb., vol. 26, p. 

 112, 1907). 



The following description of the species is based on material 

 from Menidia notata. Further details are given under the record 

 of collections. 



Body smooth, plump, more or less fusiform; suckers near to- 

 gether, the ventral much larger than the oral; pharynx nearly 

 spherical; prepharynx and esophagus none; intestinal rami extend 

 to posterior end of appendix. Genital aperture median at posterior 

 ventral margin of pharynx; cirrus and cirrus-pouch short; ejacula- 

 tory duct long, sinuous; surrounded by cells of prostate gland; 

 seminal vesicle behind ventral sucker, capacious, extending between 



