604 DR. F. E. BEDDARB ON 



random from the same host would hardly be likely to prove both 

 abnormal in any way. Finally, we, have in these segments 

 rounded sacs with ripe eggs, though it must be admitted that 

 these were eggs and not embryos. Some riper proglottids may, 

 however, be missing ; but even then the commencement of the 

 paruterine organs would surely be visible. 



It is therefore, as I think, impossible to include these worms 

 in either of the genera with which I have just compared them. 

 Of the remaining Anoplocephalidse (to which family I think 

 that these worms must be referred) there are only the genera 

 belonging to the subfamily Anoplocephalinm. Of these Cittotcenia 

 and Moniezia need not be considered, since their generative 

 apparatus is double in each segment. Of the remaining genera 

 none agree with the two worms under consideration in all of the 

 following points, viz., uterus at most inconspicuous, cirrus sac 

 small, genital pores unilateral, ovary to pore side of proglottids, 

 genital ducts pass between excretory vessels, testes posterior. I 

 believe, therefore, that they must be referred to a new genus. 



This new genus may be thus defined : — 



Hyracotsenia. 



Scolex unarmed, with four unarmed suckers. Proglottids ivide 

 amd very short, a little longer at extreme end of body, hut always 

 much wider than long. Genital pores unilateral, not home upon 

 papillae. Cortical farenchyma thick, separated from medullary hy 

 a thin layer of circidar fibres. Water vascular tubes four, dorsal 

 and ventral, the latter larger, connected by a network of capil- 

 laries. Testes numerous, dorsal in position, lying behind and to 

 sides of ovary ; vasa efferentia forming a network ; sperm-dtict 

 wide and. sinuous or coiled ; cirrus sac small ; a short hlunt ivide 

 penis protrusible. Ovary near water-tubes of pore side, single, in 

 front of vitelline gland; dilated receptaculum seminis and very 

 narrow vagina. Uterus small and sac-like ; paruterine organs 

 absent. 



Hab. Procavia capensis. 



It is not possible for me to distinguish definitely at present 

 between generic and specific characters. The above embody 

 characters usually considered in generic definitions. The two 

 species may be, for the present at least, defined as follows : — 



(1) Hyracotsenia procavisB, sp. n. 



Length about 90 mm. ; greatest diameter 5-6 mm. Body attains 

 its greatest width about 25 mm. from anterior end. Testes very 

 numerous. Sperm-duct rather dilated posteriorly, much coiled 

 anteriorly. Ovary ventral, on outer side only or both sides of 

 ventral vessel ; vitelline glands dorsal. Vagina not greatly dilated 

 posteriorly. 



