12 ILLINOIS BIOLOGICAL MONOGRAPHS [362 



The genital pore is on the right margin, two-thirds the length of 

 the proglottid from the anterior end. The cirrus pouch is a stout, 

 pearshaped structure, 155/a long, 75/x in diameter at its inner end, and 

 35/i in diameter at its outer. The tip of the pouch lies dorsad of the 

 ventral excretory canal just within its lateral boundary. Part of the 

 vesicula seminalis lies within the pouch; a much larger portion lies 

 without, dorsad of the ventral excretory duct and extending mediad of 

 it. There is no prostate gland. The testes are dorsal, extending nearly 

 if not entirely across the median field, and into the lateral field on the 

 side away from the genital pore. On the pore side of the field they are 

 confined to the region anterior to the ovary; on the opposite side they 

 are slightly more posterior than anterior. They number 43 to 57 in 

 eight proglottids counted and average about 50/x long, being slightly 

 smaller in other dimensions. They break down early but each remains 

 distinct within its membrane. 



The vagina lies entirely posterior to the cirrus pouch, and in the 

 same dorsoventral plane. Its walls are beset* with glands. Dorsad of 

 the ventral excretory duct and extending beyond it on either side is the 

 very large receptaculum seminis which is somewhat constricted in the 

 middle, giving it a two-lobed appearance. The ovary consists of about 

 15 distinct lobes, which radiate in all directions from the point of origin 

 of the oviduct. The posterior lobes, which are much shorter than the 

 rest, extend distad on the ventral side of the transverse commissure to 

 near its posterior limit. The oviduct begins just anterior to the trans- 

 verse commissure, four-tenths of the diameter of the proglottid from 

 the pore margin. 



The uterus is reticular tho there is a tendency for the tubes not 

 to develop. The uterus thus tends to become what might be termed 

 diffuse. Certain main ducts develop regularly; the rest of the cavity 

 is usally formed by the mere expansion of these. In front of the ovary, 

 near the median line, the uterus is represented by a single tube ; to the 

 right and left it widens distally until near the excretory ducts ; it then 

 crosses beyond these ventrally. The later development of the uterus is 

 by regular outpocketing. The embryo is about 20/a in diameter. It 

 bears a large pyriform body whose length plus that of the embryo is 

 30/*. The outer embryonic membranes are mostly elongate; when 

 spherical, the outer membrane has a diameter of 30 to 32^. The middle 

 membrane is loose fitting and irregular. The uterus of this species is 

 almost identical with that of the genus Andrya and therefore different 

 from that of other closely allied genera. Likewise the distribution of 

 the testes is fundamentally the same. This species however disagrees 

 with other known Andryae in that it has no prostate gland, and in that 



