10 DR. F. E. BEDDARD ON 



Between this row of bundles and the subcuticular layer are other 

 longitudinal fibres which are not massed so obviously into a series 

 of separated bundles. Farther back in the body the bundles get 

 smaller and further apart, and ultimately disappear altogether. 



The strobila of this tapeworm shows posteriorly a very marked 

 delimitation between the individual proglottids, which are con- 

 stricted at their junctions and thus produce a necklace-like appear- 

 ance, as is often seen in other tapeworms, e. g.,Davainea. I describe 

 the same appearance in an equally small or rather smaller species 

 from Varanus varius. In transverse sections through the ripest 

 segments that I have been able to examine, but which were by 

 no means fully mature, the structure of the body is much like 

 that of other Ichthyotcenia. The general parenchyma is very 

 delicate ; the subcuticular layer of glandular cells is very marked, 

 and the cells are deeply stained as compared with the neighbouring 

 parenchyma. 



I could find no layer of longitudinal fibres within the sub- 

 cuticular layer. They seem to me to be as plainly absent from 

 this species as from the others with which I deal in the present 

 communication. Nor could I find any calcareous corpuscles with 

 an obvious appearance like those of the second species of Ichthyo- 

 tcenia from this Varanus, which I shall describe later. 



In the anterior segments of the body there are two water- 

 vascular tubes on each side of the body, the dorsal tube nearly 

 accurately overlying the ventral ; they are about equisized. In the 

 segments which I am now considering the ventral vessel is very 

 large, comparatively speaking, and often lies right up against the 

 subcuticular layer, thus emphasizing the difficulty — to w'hich I 

 also direct attention in other species — of distinguishing the 

 cortical from the medullary layer. The much smaller dorsal 

 vessel is present, but it is not always very easy to see. 



With reference to the generative organs I am not able to say 

 much, as they were immature. The ducts, however, pass between 

 the two water-vascular tubes on their way to the extei'ior. 



The cirrus is represented by an elongated wide tube into which 

 the sperm-duct opens at the posterior end. This is surrounded 

 posteriorly by a muscular sac, which is the cirrus-sac. The cirrus 

 hardly narrows before its opening on to the exterior. The sperm- 

 duct is only coiled once or twice upon itself, and this part lies 

 within the cii-rus-sac. The generative openings, it should be 

 mentioned, occur either on one side of the segment or the other.- 

 The middle area of the proglottid is free from testes, of which 

 three or four lie on each side of it ; so that in a given proglottid 

 the transverse rows of testes contain six or eight of these gonads. 

 The ovary is median. I am aware that the above facts are not 

 in any way distinctive of the species. They only prove that it 

 belongs to the genus Ichthyotcenia. From the chaiucters other 

 than those afforded by the generative organs it is hardly safe to 

 attempt the definition of a new species of this genus. There is, 

 indeed, nothing which positively prevents the inclusion of this 



