632 MR. F. E. BEDDARD ON 



other side ; then came two on the opposite side to these, and then 

 two on the opposite side to the two last described. These instances 

 will be sulhcient to illiistiute the general facts. It is quite 

 possible that the proglottid which first shows these openings may 

 vary from individual to individual. In any case a careful 

 examination of a small individvial mounted in two pieces upon 

 a slide, and whose strobilisation has been already described above, 

 showed no generative ducts in front of proglottid 113 or so. It 

 Avill be remembered that this woi-ni had a limited number of 

 proglottides altogethei, there being not many, if any, more than 

 167. In this particulai- case it was not difficult to ascertain 

 accurately the point at which the ducts began. For, where 

 present, they were extremely conspicuous through staining, and 

 the cells composing the conjoined ducts foi'med a rather thick mass. 

 And I am, therefore, sure that they did not exist, except perhaps 

 in small rudiments, before the 113th proglottid. It was easy to 

 ascei'tain that the gonads themselves — at any i-ate, the ovaries 

 — existed anteiior to this segment. Furthermoi-e, these facts 

 are still further suppoited by the condition of a second specimen 

 which had been cut into longitudinal sections up to ahout the same 

 point of the body. Here, too, the generative ducts did not exist 

 much anteriorly to the 1 13th segment — if, indeed, at all anteriorly. 

 The actual pores were only clearly visible upon more mature pi-o- 

 glottides, and wei-e quite conspicuous round oiifices near to the 

 anterior border of the proglottid. 



The excretory vessels would seem from the figures of Janicki 

 to be veiy characteristic of the genus Oochorisiica, for in the species 

 figui'ed by him thei'e are additional lateral vessels varying 

 according to the species. I have found the same thing in the 

 species of Oochoristica which I describe in the present paper. 

 The conditions, however, seem to vaiy somewhat in different 

 regions of the body. Anteriorly there are eight, longitudinally 

 running, which in the very anterior and therefore very thin 

 segments are almost in the same plane, and therefore can be seen 

 in a single longitudinal section. Further back the eight tubes are 

 differently arranged. There are two nearer to the middle line 

 and dorsal, according to Janicki*, and two ventral more widely 

 separated. The two lateral tubes on each side ai-e less mai-kedly 

 dorsal and ventral respectively. In posterior segments I could 

 see only six longitudinal vessels, as is represented in text- 

 figu.re 150, of which the four median wei'e placed alternately 

 with regard to each other, and not as in earlier segments. 



The gonads are visible in sections rather early in the body. 

 I found them without any trouble in the rather wider segments 

 which follow immediately upon the anterior sixty or so segments 

 which form the anterior section of the chain of proglottides. 

 A somewhat leaf -shaped mass of cells, the apex directed posteriorly, 

 and which i-epresents presumably the yolk-gland as well as the 



* Loc cit. 



