The family Koellikeriadae. 163 



They twist about among the uterine coils so tliat in every section 

 they appear repeatedly, cut in various directions and containing a 

 faint grannlar coaguluni. In spite of protracted eitbrt, liowever, \ve 

 could not determine wliere the orifice is situated. 



Almost the whole body of the worni is occupied by closely 

 twisted coils of the extremely long and wide uterus which is filled 

 with yellow eggs. This gives the general yellow color which shines 

 throngh the wall of the cyst. Among these coils one even wider 

 straight length of the tiibe can be seen to Stretch forward to the anterior 

 end of the body. Among them, too, especially throughout the posterior 

 portion there are mingled many coils of a narrower tube which is of 

 a deeper brown color and in the more anterior part similar coils 

 of another tube which appears rather white in the unstained worm 

 but takes a bright nuclear stain which makes it conspicuous in the 

 stained specinien. This proves to be the ovary, the brown tube in 

 the posterior part the vitellariura. At the junction of the anterior 

 and middle thirds of the body there is a space among all these 

 coils in which one can make out a pear shaped seminal reservoir, 

 a voluminous shell gland and the junction of all the tubes. The 

 ovary lies in front of this space, the vitellarium behind it. The 

 Uterus opens abruptly in an almost uuguarded slit just behind the 

 mouth sucker at a point immediately behind and adjacent to the 

 opening of the vas deferens. Studied in serial sectioiis the following 

 relations are found to prevail. The ovary is a pratically solid cord 

 of great length and making many folds — it is tubulär only in the 

 sense that the central cells are less compactly placed than the 

 outer ones. It reaches the point mentioned above without narrowiug 

 appreciably and joins a narrow rather thickwalled canal which 

 receives at the same point the neck of the seminal reservoir and 

 the narrowed Channel from the vitellarium. There is no Laueer's 

 canal. The seminal reservoir is a rounded sac beut on itself and 

 tapering into a rather long neck. It is always found closely packed 

 with bundles of stiff looking spermatozoa. The vitellarium seems 

 to be a Single convoluted tube which extends back with the uterus 

 to the extreme posterior end of the body. It is lined with cubical 

 or pjTamidal cells which contain many highly refractive brown 

 granules and the smaller cells which fall olf into its central part 

 constitute the yolk. They are indeed extremely small. These three 

 ducts join at a point wliere they are surrounded and imbedded deep 

 in a large conspicuous mass of cells radially arranged which one 



