424 



Dr. II. A. Baylis on a net 



muscular chamber. The cirrus-sac (fig. 2, c.s.) is more' 

 elongate than in Tctrabuthrlus, and measures al)out 

 0'12o mm. in length and U'05 mm. in thickness. Tliere 

 is a much-coiled vas deferens. The vagina, near its oi)en- 

 iiig into the genital atrium, is very narrow, but after a short 

 distance widens suddenly into a large thin-walled tul)e. 

 This runs towards the middle Hue of the segment, and then 

 curves dorsal ly, narrowing again here and becoming in- 

 vested with a conspicuous outer coat of glandular cells. 

 The large testes (tigs. 2, 3, /.) arc about thirty in number, 

 and are mostly situated on the dorsal side of the segment. 

 !Some, however, lie at the level of the uterus, espi-cially 



Fig. 3. 



0-1 mnn. 



Anophryocephalus anophiys. Horizontal section through a 



mature segment, towards the ventral side. 



e., c, excretory vessels ; m., one of the longitudinal muscle-bundles ; 



n., nerve ; ov., ovary; «., shell-gland; <., testis; ri?., 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-directcd, 

 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, n'/.), 

 its duct passing ventrally to the " waist" of the ovary 

 straight back towards the shell-gland. The uterus 

 (fig. 2, ut.^ appears as a crescentic transverse tube, as in 



