NO. 1560. PARASITES OF BERMUDA FISHES— LINTON. 115 



Dimensions, in millimeters, balsam: Length 1.57, diameter 0.52; 

 oral sucker, leno-th 0.11, breadth 0.12; diameter of pharynx 0.09; 

 ventral sucker, length 0.35, breadth 0.33; ova 0.018 by 0.009, mainly 

 at the posterior end of the body. Vitellaria diffuse in median part of 

 the bod}^; oral sucker retracted, ventral sucker also slightly with- 

 drawn. 



The length of the fragment is 3.75 mm. It represents onlj^ the 

 post-acetabular region. 

 Distoinuin^ species from Tylosurus aens. (Plate VIII, fig. 62.) 



July 16, one. Color of body orange, neck light orange, suckers 

 whitish. The bod}" is fusiform, tapering more to the posterior end 

 than to the anterior. Ventral sucker larger than oral; pharynx sepa- 

 rated from oral sucker by a pre-esophagus. Ovar}" subglobular, 

 behind ventral sucker; uterus between ovar}^ and ventral sucker and 

 passing to the left of the ventral sucker to the genital aperture, which 

 is in front of the ventral sucker and on the left of the median line. 

 Vitellaria diffuse lateral and posterior, abundant, extending to ventral 

 sucker. Testes not clearly made out, but appear to be represented by 

 a mass of cells behind the ovary. Cirrus and its pouch in front of the 

 ventral sucker, and to the left. Ova few and large. 



Dimensions of mounted specimen, in millimeters: Length 1.77; 

 diameter, anterior 0.25, at ventral sucker 0.63, near posterior end 

 0.15; diameter of oral sucker 0.22, of pharynx 0.13, of ventral sucker 

 0.36; ova 0.07 by 0.01:. 



According to the later classification of the distomes this species 

 probably belongs to the genus Allocreadtimi. 

 Distomum , species from Chxtodon^ species. (Plate X, fig. 69.) 



July 30, two; August 3, four; all the specimens in poor condition, 

 as if macerated. 



So far as could be made out from these imperfect specimens they 

 have the following characters: Ventral sucker a little larger than oral; 

 ovar}" with three or four lobes and situated half way lietween the ven- 

 tral sucker and the posterior end; vitellaria abundant, diffuse, at pos- 

 terior end and along margins to ventral sucker, overlying other 

 organs in places. To the rear of the ovary and at its right side are 

 about nine bodies which appear to be testes. The cirrus and its pouch 

 were indistinctly seen, but they appear to pass dorsal to the ventral 

 sucker to open in front of it on the left of the median line. There is 

 a distinct prostate, with a seminal vesicle at its posterior edge, just 

 behind the ventral sucker. In a larger specimen than the one 

 sketched the seminal vesicle is farther back; the ova are rather few, 

 mostly in front of the ovaiy, but a few are behind it, or at least very 

 close to it. The uterus passes to the left of the cirrus to open 

 immediately in front of the ventral sucker, and close to the median 



