235] PROTEOCEPHALIDAE—LA RUE 235 



ing 0.06 by 0.04 mm., 0.062-0.072 mm., and 0.07 by 0.04 mm. They are 

 arranged in two fields which in elongated proglottids are near the 

 ventral excretory vessels while in contracted proglottids (Figs. 109, 

 110) they are some distance from the ventral vessels. In the former 

 case the testes of each field are arranged in two irregular rows while 

 in the latter case the testes of each field are irregularly arranged in a 

 broad zone. The testes are dorsal to the uterus. The vas deferens 

 forms a mass of coils which extend from the cirrus-sheath nearly to the 

 middle of the proglottid. The writer's drawings (Figs. 109, 110) show 

 it more heavily developed than do the figures of Marotel (1899) which 

 are reproduced (Figs. 197, 198). 



The cirrus-pouch is relatively short and broad, 0.25-0.29 mm. long 

 by 0.100-0.136 mm. broad. In the broad mature and ripe proglottids 

 it extends but a short distance within the vitellaria. The ratio of its 

 length to the breadth in mature proglottids is about 1 :6, in ripe pro- 

 glottids about 1 :5 or 1 :5.5, in the ripest proglottid observed about 1 -A. 

 Schwarz states that the cirrus-pouch is about 0.33 mm. long. The 

 ductus ejaculatorius (Fig. 109) has numerous coils. The unprotruded 

 cirrus is broad and muscular. The writer has not seen it protruded 

 and no other investigator reports having seen it thus. An examination 

 of Marotel 's figures which have been reproduced (Figs. 197, 198) shows 

 fewer coils of ductus ejaculatorius and of vas deferens than do the 

 drawings of the writer (Figs. 109, 110). This can be explained by the 

 assumption that Marotel could not follow these structures out com- 

 pletely in his preparation which he states was made from material in 

 a poor state of preservation. The material upon which the writer 

 worked was in a fair state of preservation and in preparations made 

 from it these ducts could be traced with ease. 



The vagina at its distal end is broad, measuring 0.09-0.12 mm., a 

 breadth due in part to the breadth of its lumen and in part to the 

 thickness of its sphincter vaginae. In this region the vagina is nearly 

 as broad as is the cirrus in its basal portion. In its course to the middle 

 of the proglottid the vagina never crosses the cirrus-pouch. Arrived 

 at the middle of the segment it bends sharply and takes a sinuous 

 course posteriad to the interovarial space which it enters after passing 

 over the dorsal side of the ovary, not the ventral as Marotel figures it. 

 There are no coils of the vagina anterior to the ovary. A receptaculum 

 seminis has not been observed tho from its occurrence in other species 

 in the genus its presence in this species may be inferred. The lobes 

 of the ovary in nearly mature proglottids are more slender and more 

 pointed at the extremities than in mature and ripe proglottids. In well 



