44 TREMATODES OF THE NORTHUMBERLAND COAST 



equal parts, and is enclosed in the cirrus sac. The latter 

 measures 0-30 mm. in length, and is placed somewhat 

 obliquely, the dorsal part being to the right and the ventral to 

 the left ; it contains, in addition to the vesicula seminalis and 

 in front of it, a large pars prostatica, the glands of which fill 

 the sac. The cirrus was not seen. The ovary and parts 

 connected with it have not yet been clearly made out, but the 

 former probably occurs much in the same position as in 

 S. furciger, as the ducts from the vitellaria join in a small 

 triangular reservoir in much the same position as in that 

 species. The uterus is very long and winding, much longer 

 than in S. furciger, and finally runs up in a straight duct to 

 open into the gential sinus. The eggs are a bright brown 

 with a distinct green shade, and are pointed at one end and 

 round at the other ; they measure o'046 X 0*026 mm. It is 

 from the shape of the eggs that the species is named ovactttus. 

 The vitellaria occur far forward, beginning anterior to the 

 centre of the ventral sucker and reaching to the level of the 

 fork of the intestine. They are arborescent, and three main 

 ducts run from each of them, which soon unite into one on 

 each side; and finally these join together in the reservoir 

 mentioned , above. 



It is hoped to describe the female organs in more detail 

 hereafter. Meanwhile, the above characters make it, I think, 

 certain that we are here dealing with a distinct species of 

 Steringophorus. 



