28 JOHN E. GUTBERLET 



toward the vagina which is directly posterior to it. The cirrus was 

 not observed extending from the genital cloaca, but was noted in 

 some specimens curving toward the vagina, though not passing into 

 it. A few sperm cells were present in the vas deferens, also in the 

 vagina and the seminal receptacle. 



Female Reproductive Organs: The large ovary (Fig. 14, o) 

 lies in the anterior third of the proglottid and extends transversely 

 across the segment. It has a length of 300/i. and a breadth of about 

 75 or 80/1, at its broadest point. It is irregular in shape, being com- 

 posed of a number of lobes. The end which is nearest the genital 

 pore is smaller than the other, allowing room for the mass of coils 

 of the vas deferens, the vagina, and the seminal receptacle. The 

 ovary is concave on the dorsal surface and convex on the ventral. 

 On the dorsal surface of the end nearest the genital pore is located 

 the seminal receptacle and the vagina. The ova are large and very 

 distinctly shown in the ovary (Fig. 16). Posterior to the ovary is 

 the large yolk gland (Fig. 14, 16, y) which lies about the middle of 

 the proglottid. It is irregularly elongate in shape and extends 

 transversely across the segment, having a length of from 120 to 

 ISOfi and a breadth of from 35 to 50/i,. Immediately in front of and 

 dorsal to the yolk gland and posterior to the ovary is the shell gland 

 (Fig. 14, sg) which is slightly ovoid in shape, 40 to 50/x in diameter. 

 A small duct, the vitelline duct (Fig. 16, v), passes from the yolk 

 gland through the shell gland from which it receives a duct. The 

 combined ducts after passing through the shell gland unite with the 

 oviduct (Fig. 16, ov) which appears as a curved tube leading from 

 the ovary. These united tubes or ducts pass anteriad and slightly 

 ventrad into the uterus which develops as a blind tube in the region 

 of the ventral lobes of the ovary. This blind tube (Fig. 16, «) 

 grows in size and extends transversely across the segment. As it 

 becomes larger the tube forms pockets which extend anteriorly and 

 posteriorly and also dorsally, until it takes up the entire mass of 

 the proglottid between the excretory canals. In gravid segments 

 it even extends beyond the excretory canals. A small tube or duct, 

 which is really the end of the vagina, connects the seminal recep- 

 tacle with the yolk-shell gland duct and oviduct. This tube serves 

 to carry the sperm to the eggs in the oviduct for fertilization. The 



