424 Dr. H. A. Baylis on a new 
muscular chamber. The cirrus-sac (fig. 2, c.s.) is more 
elongate than in Tetrabothrius, and measures about 
0°125 mm. in length and 0:05 mm. in thickness. There 
is a much-coiled vas deferens. The vagina, near its open- 
ing into the genital atrium, is very narrow, but after a short 
distance widens suddenly into a large thin-walled tube. 
‘This runs towards the middle line of the segment, and then 
curves dorsally, narrowing again here and becoming in- 
vested with a conspicuous outer coat of glandular cells. 
The large testes (figs. 2, 3, ¢.) are about thirty in number, 
and are mostly situated on the dorsal side of the segment. 
Some, however, le at the level of the uterus, especially 
Fig. 8. 
Anophryocephalus anophrys. Horizontal section through a 
mature segment, towards the ventral side. 
e., e., excretory vessels; m., one of the longitudinal muscle-bundles ; 
N., nerve; ov., ovary; s.,shell-gland; ¢., testis; vit., yolk-gland. 
anteriorly and posteriorly to it, and a few are even found 
still more ventrally. The ovary (figs. 2, 3, ov.) is a large 
bilobed organ, occupying the whole width of the medullary 
parenchyme when fully-developed. It has a narrow “ waist” 
in the middle region, and two large, backwardly-directed, 
lateral lobes. In the space between these lobes is situated 
the shell-gland (fig. 3, s.). In front of the middle portion 
of the ovary is the compact yolk-gland (figs. 2, 3, vit.), 
its duct passing ventrally to the ‘‘ waist” of the ovary 
straight back towards the shell-gland. The uterus 
(fig. 2, wt.) appears as a crescentic transverse tube, as in 
