The family Koellikeriadae. 155 



series a quite similar narrow Prolongation was found witli uterus, 

 intestinal coeca etc. but tlie end was broken oft" before the actual 

 head Avas reached. Nevertheless the structnre was so similar to 

 that of the head in the otlier series that there seems no doubt that 

 this is the head of one worm. In this second series another head 

 was found with pharyngeal bulb, Oesophagus and a strongly developed 

 vas deferens lilled with spermatozoa. Two worms exist, therefore, 

 in the second series: possibly only one in the flrst. The series will 

 be described separately. 



The first series : The head and neck are extremely slender and 

 tapered anteriorly. Where the neck passes into the general tangle 

 of folds of the body it becomes much wider and quite dense in 

 structure. The mouth is terminal, guarded by no sucker but opening^ 

 directly into an elliptical pharyngeal bulb. From this the Oesophagus 

 runs a short way and bifurcates into narrow, very thinwalled 

 intestinal coeca which run far back into the body of the worm but 

 do not brauch again. The uterus, which is extremely narrow at its 

 termination, opens just behind the pharynx. In the neck it is very 

 muscular and this thick wall can be traced far back into the body. 

 No trace of the vas deferens can be seen there. A short way 

 behind the bifurcation of the intestine there is a minute but quite 

 distinct ventral sucker. This is almost embedded in the parenchyma 

 but does not open on the surface. It is extremely weak and small 

 and is rather indistinctly outlined. 



The nervous System is visible in its coarser features in the 

 form of the usual pair of ganglia about the Oesophagus. The 

 excretory System in the form of one or two thinw^alled tubes appears 

 in the neck and courses through the rest of the body. 



The main bulk of the worm is occupied by the female organs 

 of generation which are arranged as follows. Exten ding back from 

 the anterior orifice the uterus widens and courses along through 

 every fold, twisting and turning so that in some places it is cut 

 two or three times, in others only once. It runs back through the 

 whole body once as a rather straight tube exactl}'' as in Nemato- 

 hoihrium sardae and then in coils comes forward again. At one point 

 in the body all the uterine coils are pushed aside by the great mass 

 of the Shell gland and within this there takes place the union of 

 the portions of the reproductive System. The ovary which is long 

 and cord-like lies in the anterior, part of the body. The vitellarium, 

 also long and cord-like or tubulär, extends through the posterior part. 



