47] PROTEOCEPHALIDAE — LA RUE 47 



The genital pore is marginal, irregularly alternating, and situated about 

 the middle of the proglottid length. It is rather prominently situated 

 on a little eminence which is most evident in ripe proglottids. This 

 eminence may be caused by a pushing out of that region by nearby 

 organs. 



The cirrus-pouch measures about 0.130 mm. long by 0.032-0.0-10 

 mm. broad. Its length goes into the proglottid breadth from three to 

 four times. The cirrus-canal, as Schneider states, is greatly coiled 

 within the cirrus-pouch and it broadens out at its proximal end to form 

 a vesicula 0.030 mm. broad. Coils of the vas deferens form a mass 

 which lies toward the porose side of the proglottid. The testes in the 

 preparation examined by the writer lie in two layers of about 35-50 

 testes each. Thus the total number of testes is about 75-90 or more. 

 Schneider found that the testes measure 0.055-0.062 mm. in sagittal and 

 0.035-0.045 mm. in frontal diameter. 



The vagina lies anterior to the cirrus-pouch. Schneider found a 

 weak sphincter vaginae near the vaginal opening. It was not visible 

 in the specimen which the writer studied. The vagina passes in a curve 

 to the middle of the segment and thence posteriad to the interovarial 

 space. Schneider found a small receptaculum seminis just anterior to 

 the ovary. The vitellaria are quite compact follicular masses in the 

 lateral fields of the segments. Of the ovaries Schneider writes, "The 

 ovaries appear as spherical bodies when seen from the surface. In the 

 posterior segments, after they have filled the uterus with eggs, they 

 wither completely or the remains of the genital organs, pressed together 

 into a triangular area, are recognizable as two small round bodies in the 

 posterior region of the segment. I hold that Grimm (1872, p. 246) erro- 

 neously considered this triangular area to be the ovary when he says : 

 'the ovary lies in the middle of the segment and has in its observed 

 condition a spindle-like appearance' ". The ovary is bilobed, the some- 

 what spheroidal lobes being connected by a short arched mid-piece. In 

 the ripe proglottids observed by me the ovary could still be distin- 

 guished. The uterine passage was found by Schneider opening into the 

 uterus posterior to the middle of the proglottid and opposite to the pre- 

 formed opening of the uterus to the exterior. When immature the 

 uterus is a median tube but when fully developed it has 5-7-8 lateral 

 pouches on either side. 



As observed by Schneider the outer membrane of the egg has a 

 diameter of 0.050-0.075 mm. The embryonal covering measures 0.032 

 mm. and the embryo itself 0.027 mm. These measurements of the egg 

 agree pretty well with the measurements as given by Dujardin (1845). 

 The embryos especially agree well in size, and it may be pointed out 

 that this is of importance in seeking to prove an identity. 



