On the structure of Taenia gigantea (Peters). 383 



species although in one instance tlie host was the Indian rhinoceros 

 and the other the African. In this case we have apparently the 

 same species from the Java rhinoceros, although since the descrip- 

 tions of Peters and Murie are so meagre that no details of the 

 anatomy can be derived from them, it is impossible to feel sure that 

 there are not actually three distinct species which resemble one 

 another in their general form. 



The body of the worm is so thick that it is impossible to make 

 out anything of the internal structure except by meaus of serial 

 sections. These were made transversely, horizontally and sagittally 

 through both the niature and the younger Segments. It was found, 

 however, that in the mature Segments, the structure of the internal 

 Organs had been practically obliterated by the size of the uterus 

 which was füll of eggs. Merely remnants of the genital apparatus 

 could be Seen at one .margin, and although the nervous System and 

 excretory System were indicated, such segments on the whole scar- 

 cely lend themselves to the general determination of the arrangement 

 of the Organs. On the other hand, sections through segments of 

 about 2,5 cm in width show as yet no accumulation of completely 

 forraed eggs and the organs are all intact. 



The S k i n and M u s c u 1 a t u r e. In sagittal sections, the over- 

 hanging margins of the proglottides appear as projecting triangles 

 which are covered with a smooth cuticle. In the furrows between 

 them this cuticle becomes somewhat thicker. Underneath it there lies 

 every where a layer of thin muscle fibers running transversely to the long 

 axis of the worm. Tkere are a few other fibers which run obliquely 

 and longitudinally and which lie among the outgoing canaliculi of 

 the cutaneous gland cells which form a thick layer beneath. The 

 general body musculature is quite strongly developed especially in 

 the form of longitudinal bands which run through from segment to 

 Segment. Gross bundles traverse each segment from dorsal to ventral 

 surface and radiate out in arching fashion to the anterior or upper 

 convex suiface of the free, overhanging margins. The longitudinal 

 bundles also give off fibers which radiate into these margins from 

 below to fix themselves also in the convex or upper surface. Trans- 

 verse bundles of muscle run from margin to margin of the pro- 

 glottides just inside the longitudinal bundles. These, like the sagittal 

 fibers, seem to accumulate in greater abundance in the lines between 

 the proglottides. 



The Parenchyma. The general parenchyma of the worm is 



