400 J. STAFFORD, 



The animal mounted measures 0,92 mm in length (accurately 

 *.i27 //), and 0,22 mm in greatest breadth. Sections of the other 

 specinien show a circular outline. 



Most couspicuous, of the organs are the two suckers. They are 

 equal in size and, in proportion to the mass of the animal, are relatively 

 powerful adhesive organs. The oral sucker, in its natural position, looks 

 downwards and forwards and the ventral sucker lies behind it at a 

 distance of about one quarter of the length of the animal. 



The integument is supplied with a cuticle laid out into a suc- 

 cession of rings of which the posterior rim of eaeh appears to project 

 over the one succeeding it. Under high maguification it can be seen 

 that each ring contains a circular row of small spines. 



So far as I have yet determined, the body walls and the paren- 

 chyma filling the intervals between the several visceral organs agree 

 in structure with other Trematodes. 



The intestinal System is composed of a mouth, a pharynx and 

 two blindly ending lateral branches. 



A nervous System is present in the shape of a supra-pharyngeal 

 transverse band, and I suppose lateral nerves are present although I 

 have not distinguished them. 



The excretory System remains entirely unknown, unless a portion 

 which I shall shortly have to refer to is to be considered the ex- 

 pulsion canals. 



This Trematode is, as usual, hermaphrodite — both male and female 

 reproductive organs being present in the same iudividual. Two testes 

 are situated between the intestinal caeca immediately behind the ventral 

 sucker. They lie right and left, one being partly behind the other; 

 their greatest diameter is in the vertical axis. 



Behind these again, about the middle of the body, is the ovary, 

 while laterally from it but slightly more posterior are two yolk glands. 



Before the worm was mounted, wheii, upon making a change of 

 alcohol the ditfusion currents caused it to roll over and over, it seemed 

 as if the yolk glands were lobed and connected with one another 

 across the middle of the body. The connective was no doubt the 

 transverse vitelline ducts which contained enough yolk to be made 

 visible. The ducts of the reproductive glands I have not followed but 

 their distal ends meet and open to the exterior just in front of the 

 ventral sucker. One fold of the uterus, containing small nucleated 

 spherical ova, crosses over the pharynx from side to side. 



I have now to describe an organ which appears to me to be of 



