408 J. STAFFORD, 



Turtle {Chrysemys picta). It is a long, narrow {anqustum)^ very thin 

 aüinial. Its leiigth, wheu mouiited, is 3.150 mm, its breadth 0.455 mm, 

 The anterior sucker measures 0.125 mm ; the posterior, ventral sucker 

 0.095 mm broad, is situated 0.875 mm farther back. 



The Pharynx, 0.075 mm long, is situated 0.050 mm from the mouth- 

 sucker, and there is another, longer, constricted, piece, the Oesophagus, 

 0.225 mm, between it and the forking of the intestine. The latter is 

 very like the correspouding part in the preceding species-parasitic in 

 the Suapping Turtle. 



The unpaired part of the excretory System branches, I think, at 

 the posterior testis. 



The testes are found, one behind the other, between the ends of 

 the intestinal caeca, and the duct from the anterior one is turned to 

 the right side. The penis is a long narrow organ (length = 0.5 mm), 

 lyiug obliquely across the left caecum, with its base to the right of 

 the ventral sucker and its apex opening on the ventral surface, near 

 the left margin, a little posterior to the line traversing the forking of 

 the intestine. There is a penis sack containing a vesicula seminalis 

 and the end of the intromittent organ is, in the mounted specimen I 

 am describing, exserted from the genital pore and bent back under 

 the body. The ovary lies behind the ventral sucker, a little in front 

 of the middle of the body and between two enhirged lateral vessels of 

 the excretory System. Behind it is the yolk reservoir with the trans- 

 verse vitelline ducts. The anterior end of the oviduct — the vagiua — 

 lies on the opposite side of the ventral sucker from the penis sack 

 and opens with the latter at the genital pore. Eggs occupy the body 

 from the sucker to the anterior testis but chiefly behind the ovary 

 and between the iutestines. The vitelline glands lie between the in- 

 testines and the body walls, extending from the region of the genital 

 pore to near the anterior testis. 



Remarks on otlicr Trematodes ^). 



In the frogs of this region are found other Trematodes besides 

 the one already mentioned as a new species. Of these two si)ecies 

 have been already reported. These are: 



1) I at first inteuded to publish this })aper in Canada. Accordiugly, 

 there will be found a few Statements that wore designed to assist 

 students of the subject in this country to recognize the worms or to 

 find the literature. For others this part of the subject will only be of 

 value from the Standpoint of distribution. 



