Some undescribed Trematodes. 403 



an ovary, located a little behind the middle of the animal, a long, 

 folded oviduct — the uterus — filled vvith eggs, occupying most of 

 the posterior two thirds of the body and opeuing by a bulbous vagina 

 immediately behind and to the right of the penis. To these organs 

 must be added two lobular yolk glands, lying outside of the forked 

 intestine and extending from the level of the genital openings to the 

 hind end of the animal. A longitudinal yolk duct receives the yolk 

 cells from the numerous follicles ou each side and conducts thera, by 

 a transverse tube in the region of the ovary, to a yolk reservoir that 

 communicates with the oviduct close by the shell gland. 



The egg is 45 fi X 24 i^i in size and its blunt broader end is 

 provided with a short hooked filameut. 



8. Distomum hosjntale n. sjy. 



This is a worni 4 mm in length, taken from the raid-intestine of 

 the Newt {DiemycÜlus viridescens). It is a delicate, flat Nvorm of long- 

 elliptical outline. The feature first to be noted is the shortness of 

 the intestinal caeca, which extend scarcely beyond the euclosed ventral 

 sucker. Between the two is the opening of the genital glands. 



The ovary lies to the left, not quite half the length of the animal 

 from its anterior end. The oviduct has a small receptaculum seminis, 

 and, farther back, the uterus lies, in folds and spirals, across the 

 posterior half of the body. 



An anterior testis is to be found on the right side, opposite to the 

 ovary; and on the left side, behind the ovary, is the second testis. 

 The vitellarium is paired — right and left — reaching from the 

 Pharynx to the genital glands. The expulsion canal is long. 



In the cuticle of the anterior portion of the animal are fine spines. 



In the posterior half were three small, spherical sacks each con- 

 taining a small, curved, square-headed, pointed-tailed Nematode. It 

 is due to the presence of these guests that I have selected the above 

 specific designation. 



4. IHstonium quiettmi n, sp. 



This graceful little worm occurs in the intestine of the frog, in 

 the brown region round the opening of the bile duct and posterior 

 to this. 



It is somewhat cigar-shaped, compact and symmetrica! in form. 

 It measures, when fixed, about 3 mm in length and scarcely 1 mm in 

 breadth. The one from which the drawing, Fig. 4, was made measured 



