ON A NEW Sl'ECIES OF FROG TREMATODE 75 



Distance between oral and ventral suckers in fixed specimens : 500// 

 (by 2.3 mm. body-length) ; 420/^ (by 2.2 mm. body-length) ; 600/^ (by 1.88 

 mm. body-length); 540// (by r.SSmm. body-length). In fully extended 

 state of body, the ventral sucker is situated nearly in, or slightly in front 

 of, the middle of body-length (figs. 1 and 2). 



Male and female genital apertures situated close together and side by 

 side, immediately in front of ventral sucker. 



Internal structure 



Cuticula 10— 15/* thick, homogeneous looking, with slightly undulat- 

 ing outer surface. It contains minute spines. These are closely situated 

 in the anterior parts of body, but grow gradually thinner in distribution 

 towards the posterior body-end. 



Both oral and ventral suckers are of much the usual structure. In the 

 parenchyma of anterior body-parts are found numerous large isolated cells, 

 •of which the significance can not be determined. 



Prepharynx nearly entirely absent. Pharynx well developed, nearly 

 spherical or distinctly broader than long, with slight indentations along 

 anterior edge (fig. 4, p). Dimensions : 120X \ 20[t (in an adult mounted in 

 balsam); 75X125/Ì (in another mounted adult); 11SX150//. (in a living 

 adult) ; 89 X 125/z (ditto) ; 50 x 83/i (in a mounted young). 



Oesophagus moderately long, 160— 30D ( « in length, gradually somewhat 

 broadening towards the bifurcation point which lies nearly midway, or 

 slightly behind the middle, between the two suckers. Intestinal caeca 

 reach behind to a level falling short of the posterior body-end by a distance 

 equal to about \ or \ the length of body. They gradually widen 

 posteriorly ; their cross-section usually present an oval outline elongate in 

 •dorso-ventral direction (figs 5 and 6, 1). 



Excretory vesicle extends as far forwards as the testes, running dorsal 

 to uterus, and finally divides into two short lateral branches. Further 

 ■course of excretory canals are not easily traceable. 



Sexual organs. — Ovary and testes situated somewhat close together 



