273] PROTEOCEPHALIDAE—LA RUE 273 



the like of which the writer has been unable to find elsewhere in all the 

 cestodes. So far as he is able to determine the ovary of other cestodes 

 always lies in the medullary parenchyma. 



At the posterior margin of the ovarian mid-piece is situated the 

 oocapt. This organ was called the "sfintere ovarico" by Monticelli. 

 The oocapt leads into the oviduct which after making several coils re- 

 ceives the vagina. Then as a fertilization passage the oviduct continues 

 until it reaches the ootype which is surrounded by the shell glands. 

 Just before entering the ootype the oviduct receives the unpaired vitel- 

 line duct. The ootype discharges into the uterine passage which passes 

 ventral to the ovary and then discharges into the uterus. It will be seen 

 from a comparison of the above description with drawings and descrip- 

 tions of similar organs in the Proteocephalidae that there is marked 

 agreement between Monticellia and the Proteocephalidae in these rela- 

 tions. However this is no more than can be reasonably expected when 

 it is remembered that practically the same plan for these organs is fol- 

 lowed throughout the whole order of Tetraphyllidea to which Monticel- 

 lia and Proteocephalus belong. Monticelli (1891) takes occasion to 

 point out what seems to be misinterpretations on the part of von Lin- 

 stow (1891) in describing these organs in Taenia longicollis. The writer 

 agrees with Monticelli in considering that von Linstow has mistaken the 

 oocapt for the ootype. A farther discussion of this point will be found 

 in the description of Proteocephalus longicollis. 



The vitellaria, which in the Proteocephalidae are lateral, follicular 

 masses, the individual follicles of which are closely grouped about a 

 central conducting tubule, are in Monticellia coryphicephala (Fig. 95) 

 widely scattered lateral follicular masses which lie in a single ventral 

 layer. In Proteocephalids the vitellaria are within the inner longitudi- 

 nal muscle layer while in M. coryphicephala they lie outside of those 

 muscles. The vitellaria are not only ventral but at the margin of the 

 proglottid they turn up toward the dorsal surface, hence when viewed 

 in a toto preparation the vitellaria at the margins seem greatly com- 

 pacted. Transections (Fig. 94) of the proglottids show the method of 

 arrangement of the vitellaria. The lateral longitudinal vitelline ducts 

 have not been seen on account of the poor histological condition of the 

 material. The paired vitelline ducts however, may be seen to arise in 

 the lateral fields and to pass toward the middle of the proglottid outside 

 of the longitudinal muscle layer. After running for some distance in 

 this relation the ducts turn dorsally and enter within the muscle layer 

 and then they pass on to the middle of the proglottid where the paired 

 vitelline ducts unite to form the unpaired vitelline duct which discharges 

 into the ootype. In all the known species of Proteocephalidae the vitel- 



