Some undescribed Trematodes. 405 



end to the middle ol" the ventral sucker was 1.487 mm while froiu 

 this point to the posterior end was 2.187 mm and between the middle 

 points of the two suckers intervened a distance of 1.225 mm. 



The intestinal System begins with the ventrally directed mouth in 

 the mouth-sucker ; this passes into a muscular pharyiix and then into 

 a narrow thiu walled Oesophagus; the latter gives origin to the bira- 

 mous intestine, the two diverticula not reaching to the posterior end 

 of the animal. 



A bunch of glands on each side of the Oesophagus sends its ducts 

 forwards to open anterior to the pharynx and other long skin-glands 

 extend forwards and open to the surface at the anterior end. 



The nervous System outside of the neckband I have not yet 

 followed. 



The excretory system seems to me, so far, to be of a slightly dif- 

 fereut type from those I have studied. From the first I missed the 

 brightly gleaming capillaries that generally cross ones view. Again I 

 searched faithfully in several animals before I found Üame cells. On 

 obtaining young specimens just beginning to fill with eggs, however, 

 I was able to find some of these funnel-organs. The cause of their 

 being more difficult in this than in many other forms is perhaps due 

 to the readiness with which the tissues begin to disintegrate and be- 

 come dark and mirky when the worms are exposed to water or are 

 compressed by the cover-slip. P'rom whatever cause, I, at any rate, 

 searched harder in this than in any of the other worms of our 

 district including Distomum cygnoides, Distomum variegafum, Distonium 

 ovocaudatum, Distomum tetracystis^ Amphistomum subclavatum, Foly- 

 stomum ohlongum, Sphyranura osleri, Planaria polycJiroa, Taenia 

 dispar. 



The number and arrangement of the funnel-organs remain to be 

 determined as does also the arrangement of the larger vessels. These 

 do not bear cilia on their walls as occurs in some forms, e. g, Aspido- 

 gaster, but their walls appear correlatively more muscular. This I 

 have noticed in the worm under discussion even in the tubes of the 

 secoud Order of size. The large collecting vessel or expulsion canal 

 extends from the testes to the posterior end of the body in the centre 

 of which lies the porus excretorius. 



Reproductive organs are represented by male and female genital 

 glands and a yolk gland, together with their efferent ducts. Two 

 spherical testes are situated in the middle of the body, side by side, 

 the left one slightly more posterior than the right. Their vasa deferentia 



