ON A NEW SPECIES OF FROG TREMATODE 



77 



•oviduct springs from mesial side of ovary and takes an oblique postero- 

 mediad course. 



The yolk-glands are ramified follicular bodies of the extent and 

 position before indicated, reaching down on each side posteriorly to a short 

 distance from the blind end of intestinal caecum. Some follicular branches 

 may extend inwards so as to occupy a position ventral to intestinal caeca. 

 Transverse yolk ducts (dg) arise from anterior parts of the glands. After 

 running mediad, each of them crosses testis of the same side on the dorsal 

 side, and the two unite together in the median line to form the common 

 yolk-duct (figs. 6 and 7, dg). This proceeds antero-superiorly to meet the 

 oviduct at the ootyp. It may be dilated in its course, forming a yolk 

 reservoir. 



Dorsally the ootyp is joined by the Laurer's canal, which is a slightly 

 winding tube opening externally at a point in the dorsal median line 

 between the two testes. Right close to its inner end, the Laurer's canal 

 bears the seminal receptacle (figs. 4 and 8, r) of an ovoid or spherical 

 shape. The receptacle occupies a position which is dorso-median to the 

 ovary. 



As usual the ootyp is continuous with the uterus, and is surrounded 

 by numerous glandular cells, the so-called shell-gland. Beginning at the 

 •ootyp, the uterus runs posteriorly. It soon begins to exhibit eggs in the 

 interior and at the same time to make convolutions. The closely winding 

 and egg-filled uterus occupies a ventral position in the body, extending 

 from the position of testes backwards, between intestinal caeca and farther 

 beyond to the posterior body-end. 



The external terminal part of uterus, i.e. the met rate rm (fig. 7, it), 

 shows a narrow lumen and muscular wall invested externally by a layer 

 •of cells. The female genital pore is situated close to one side, either right 

 or left, of the male aperture. 



The eggs (fig. 9) are of a light-brownish or yellowish color. The 

 shell at one end shows an operculum, at the margin of which the egg 



