Some undescribed Trematodes. 411 



They can extend to 1000 f.i, or contract to a rouncled lump about 

 350 /ii across. When killed in glacial acetic acid aud dehydrated with 

 ascendiüg strengths of alcohol, stained and mounted they measure 

 450 LI in length and 210 /ii in greatest breadth, The ventral sucker 

 is 186 /LI from the anterior end and is IS ^i across. It is situated in 

 the middle of the ventral surface vvhere the body is broadest. The 

 anterior sucker is never so piain as one is accustomed to find in 

 Trematodes. Perhaps this is partly due to the mouth being at the 

 end of the body aud, owing to the small size of the worm, is scarcely 

 ever turned towards the observer by pressure of the cover glass. 



Following the mouth is a narrow Oesophagus in which is situated 

 a Pharynx. The intestinal caeca are short and, viewed from the sur- 

 face, appear to clasp between them the ventral sucker. 



Couspicuous objects are the four large glands situated round the 

 forking of the intestine and between this and the ventral sucker. 

 There are two on each side, each finely granulär, nucleated and send- 

 ing ofl' from its centre a duct. The two ducts from each pair soon 

 come together and run forwards side by side, enlarge in the lateral 

 regions of the oral sucker and open on to the anterior end close by 

 the mouth opening. These glands were regarded by Leuckart ^) as 

 destined to supply a material by the help of which the worm could 

 form its capsule. 



The excretory tubes are also conspicuous objects. Near the 

 posterior pore are two lateral expulsion bulbs which narrow into vessels 

 extending forwards as far as the level of the intestinal caeca. Later- 

 ally from tliese they form a coil which becomes straightened out upon 

 the extension of the animal. As far as I could make out there are 

 two vessels given otf from this coil, one proceeds forwards to the 

 mouth sucker, tlie other turns backwards towards the excretory pore. 

 Each gives origin to lateral branches which are apparently in Clusters 

 but whether these bear the fuunels or the capillaries I cannot yet 

 decide. The rapid movements of the animal, when allowed sufficient 

 Space to move, and the way in which the vessels coil about one another 

 upon contraction of the animal, wlien its movements are arrested, 

 make it difficult to obtain a satisfactory Observation. I have counted 

 eight funnel organs whose capillaries converged apparently to the one 

 spot but I cannot say at preseut whether there is such a regularity 



1) Leuckart, Die Parasiten des Menschen, 2. Aufl., V. 1, Lief. 4, 

 132. 



