136 rr.OCEEDIN-GS of the ]SrATIO:N'AL museum vol. 83 



Genital pore marginal, at bottom of well-developed sinus, irregu- 

 larly alternating, one-fourth or less of length of proglottid from 

 anterior end. Testes DO to 100, about oO^a to TO^a in diameter, occupy- 

 ing greater part of proglottid between vitellaria, except space oc- 

 cupied by other organs. Vas deferens forms dense mass of coils 

 lying median and slightly posterior to cirrus pouch (pi. 9, fig. 3). 



Cirrus pouch large, 450ju, to 530/* long and 240/x to 265/x broad, of 

 variable shape. After entering pouch vas deferens makes about 

 three loops, then rather suddenly enlarges to form cirrus. Retracted 

 cirrus extends almost to proximal end of pouch and then twists for- 

 ward and distally to junction with vas deferens; wall thick and 

 thrown into conspicuous corrugations. Exserted cirrus extremely 

 long, up to 1.5 mm when fully exserted, about lOOju, in diameter at 

 base, tapering to diameter of 40/a at truncated tip (pi. 9, fig 5). 

 Vagina, opening just anterior to cirrus, forms crescentic curve with 

 convex side forward, about 300/a long (pi. 9, figs. 3, 5). Distal 40/t 

 or 50/x of duct with moderately thick walls, rest of curve surrounded 

 by powerful sphincter muscle, thickest on middle of convex side of 

 curve ; maximum diameter of vagina tlirough sphincter about 90/x to 

 110/* with narrow lumen, not more than 5/x or 6/* in diameter when 

 open. At end of curved sphincter region vagina opens into ex- 

 panded thin-walled tube with lumen usuall}?^ about 80/x to 90/* in 

 diameter at junction with sphincter, sometimes bulged to diameter 

 of 120/A. This tube passes toward median line of segment, curving 

 posteriorly, and then passes back to ovary, its direction frequently 

 interrupted by kinlvy folds. When empty, diameter of this portion 

 of vagina only about 20/* to 25/* but frequently expanded to a di- 

 ameter of 40/* or 50/*. Coils not noticeably more numerous just an- 

 terior to ovar3^ Behind ovary oviduct and vagina thrown into 

 several transverse loops, which could not be successfully followed. 

 Ovary bilobed, usually of rather characteristic shape (pi. 9, figs. 3, 

 4), its posterior border almost straight, extending to vitellaria on 

 each side; anterior border a deep-swinging curve, each end not quite 

 reaching vitellaria, having lateral borders nearly straight and at 

 right angles to posterior border but with anterior tips bent inward. 

 Greatest anteroposterior diameter of ovary, from tips of anterior 

 curve to posterior border, about 400/* to 450/*. Vitellaria extend 

 from near anterior border of segment to near posterior border of 

 ovary on aporal side, and from posterior side of cirrus pouch to pos- 

 terior border of ovary on poral side, only rarely any follicles present 

 anterior to cirrus pouch. Uterus spreads laterally, maintaining al- 

 most straight latei-al borders; about 15 to 20 incomplete septa on 

 each side tend to divide uterus into lobes (pi. 9, fig. 4). 



