TWO NEW TREMATODES. 855 



front. They are separated by the viterus, which passes between 

 them, but does not overlap them to any great extent. Their 

 outline is irregular, but they appear to be i-oughly triangular or 

 trilobate. The anterior testis lies almost exactly midway between 

 the two ends of the body, but its position in relation to the ovary 

 varies somewhat, and it may be slightly nearer than is shown in 

 the figure. The posterior testis is about "27 mm. behind the 

 anterior. They touch the intestinal diverticula or overlap them 

 to a very small extent. Their dimensions are, on an average, 

 •21 X "17 mm. and '22 x "19 mm. The cirrus-pouch is of moderate 

 length and uniform width, measui'ing "SI x "11 mm. It extends 

 to about the posterior border of the ventral sucker, and contains 

 a convoluted vesicula, a short jjaxs prostatica, and a fairly long 

 ductus ejaculatorius. In each of the specimens the cirrus was 

 exserted and was longer than the pouch itself. The genital 

 aperture is situated in the middle line, almost immediately in 

 front of the ventral sucker. 



The small round ovary lies just behind the ventral sucker, a 

 little to the right side, and measures "IS mm, in diameter. 

 Immediately behind it lies a somewhat smaller receptaculum 

 seminis. The yolk-glands lie on each side at the level of the 

 ovary. They are, for the most part, external to the intestinal 

 diverticula, but they also overlap them dorsally. They consist on 

 each side of about a dozen fairly large follicles, which extend from 

 the posterior boi'der of the ventral sucker to the antei-ior border 

 of the left testis. The transverse yolk-ducts cioss the posterior 

 border of the ovary. 



The uterus is poorly developed. It passes back between the 

 testes to near the posterior end of the body and returns along 

 much the same path, terminating in a short vagina. It is only 

 slightly convoluted and contains a comparatively small number 

 of eggs. It is confined within the space bounded by the intestinal 

 diverticula, and it does not form any convolutions behind the ends 

 of the intestine, as is the case in the other species of Styphlodora. 

 The ova are rather elongated, oval, possessing a large operculum 

 and, in a few cases, a small knob at the anopercular pole. They 

 measure •038-'048 mm. x •019--024 mm., the average size being 

 •043 X -021 mm. 



The features which appear to distinguish this form as a definite 

 species are the length of the intestinal diverticula and the 

 restricted extent of the uterus. It is not impossible that both 

 these features may be less marked in a fully-grown specimen. 

 In addition the yolk-glands are slightly less extensive than they 

 are in the other species of the genus. From S. serrata it is 

 further distinguished by the relatively larger size of the suckers. 

 Both S. condita and S. horrida also possess relatively smaller 

 suckers, and in these species the distance between the suckers is 

 considerably less. The only other species of Styphlodora, namely 

 S. similis Sonsino and S. hascaniensis Goldberger, present mai-ked 

 features of difference from the present species. 



57* 



