124 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



large, terminal proglottides, and on examining the latter 

 with reflected light, under a low power, they seemed to have 

 structures like the ventral suckers of trematodes. Not only 

 had these structures raised elliptic rims, but they appeared 

 to be subdivided by internal septa. Several of the ripe 

 proglottides were stained and cleared and transverse sections 

 were also made. 



Fig. 7 represents, rather diagrammatically, a reconstruction 

 made from one of these series of transverse sections. The 

 sucker-like structure is shown by the elliptical outlines in the 

 Lower part of the figure. There are no very peculiar features 

 in the anatomy of the reproductive organs. The genital pore 

 is marginal. The cirrus is long and without spines or hooks. 

 The vagina opens on the margin of the genital pit and the 

 duct itself runs forward, curves round the greatly convoluted 

 vas deferens and then runs backwards as an almost straight 

 tube of variable calibre opening into the oviduct in the usual 

 way. The vitelline glands are marginal and are greatly 

 reduced at this stage of maturity of the proglottis. The 

 testicular follicles are distributed over most of the segment 

 except that part where the ovary occurs. 



The uterine canal runs forward as a nearly straight tube 

 of restricted calibre, and then suddenly swells out to form the 

 uterus. Just at the latter place the widened-out uterus opens 

 to the exterior by a pore placed on the anterior lip of the 

 sucker-like structure. The arrangement is such as to suggest 

 that the uterus itself must have been recurved backwards 

 over the area represented by the raised sucker-like rim, and 

 that its whole external wall over this part must have broken 

 down. No stages intermediate between the condition repre- 

 sented in Fig. 7 and the immature stages generally found were, 

 however, seen. 



