420 PARASITES OF ANIMALS 



that of the animal. In short, the uterine folds may be described 

 as passing from side to side, each separate coil being twisted 

 upon itself so as to form secondary coils. In the fluke here 

 drawn I have accurately represented every winding of the duct, 

 from its vaginal outlet above to its termination, where it is 

 joined by the ovarian and vitelligene ducts in the ordinary way. 

 Only the merest traces of these smaller channels were visible ; 

 but the two oval testes were well defined, occupying a position 

 somewhat lower down than usual. There was a third organ, 

 apparently the ovary. This was less well defined, and situated 

 higher up in the middle line. The vitelligene glands occupied 

 the usual position. The terminal cells or capsules with their 

 efferent ducts were well seen in several specimens. The water- 

 vascular system was constantly visible, or at least that part of 

 the main channel which expands into a large vesicle imme- 

 diately above the central point of the tail. At this part several 

 of the specimens ruptured. In all of the worms the lower end 

 exhibited a sort of tail, resulting from post-mortem changes. 

 None of the Edinburgh specimens of Campula displayed either 

 the slightest trace of this projection or of the water-vessel con- 

 nected with it. The uterine duct was filled with eggs. Ap- 

 proximately, the ova gave a measurement of ^' from pole to 

 pole by 5^5" in breadth. Although in Anderson's specimens the 

 integumentary spines had fallen off, they are still attached in 

 my original specimens from Edinburgh. The spines average 

 sgg" in length. With their shafts directed downwards they 

 separately presented the form of a long cone, the base of which 

 was only^" broad. After describing the above-mentioned 

 trematodes I received a letter from Dr Anderson, in which he 

 enclosed a sketch of a parasite taken from the small intestine of 

 another Platanista. The illustration evidently represented a 

 new species of cetacean fluke which I called Distoma Andersoni, 

 with the following diagnosis : " Body oblong, smooth exter- 

 nally, uniform in thickness, six times as long as broad; head 

 with lateral projections ; ventral sucker large and prominent ; 

 neck much constricted; tail evenly rounded off, blunt. Length 

 J", breadth about ^"." This worm, which was discovered by 

 Anderson, in March, 1873, is figured in my memoir communi- 

 cated to the Linnean Society. Only one parasite was found. 

 The figure in question shows that in this species the testes are 

 globular and placed high up in the middle line of the body. A 

 small lobed gland immediately above the testes is probably the 



