ON A NEW HUMAN TAPE- WORM (BOTHRIOCEPHALUS SP.). 381 



cirrus from left, points to the resiciila >ieminalis^ which is better seen on 

 the cirrus next to the right.) 



The vas deferens (ed., üg. 10) is seen in sample I^o. '2 as a thin 

 cellular string with no recognizable lumen and in samples No. o and 

 No. 4 as a thni-walled, much convoluted tube filled with spermatozoa. 

 After startinîT from the vesieida seniinalis it turns towards the median 

 line, i.e., to the rio-ht if it belonofs to the left set of ofenital ducts, and vice 

 eersa. It then pursues its irregular course for a variable distance but 

 always stopping sh(.)rt before the end of the first uterine loo]) of the 

 corresponding side is reached. How it c(jnnnunicates witli the testes 

 could not be observed. — 



Of the female sexmd organs, the eilellariiun (dis., fig. ,S) is yet 

 very scantily and weakly developed iji sample No. 2, but fully 

 developed in samples No. o and No. 4. In these it consists of very 

 numerous lobules about 0.025 mm. broad and about 0.045 mm. long, 

 with their long axis directed perpendicularly to the body -surface. 

 Arranged in a single layer, they occupy the usual position outside of 

 the layer of strongly developed longitudinal nuiscles and are nuich 

 more numerous on the ventral than on the dorsal side. On the 

 former they are distributed almost uniformly throughout except at 

 regions occupied by the two sets of main genital ducts (fig. 7). At 

 the body-margin they i)ass in a continuous layer mU) those <jf the 

 dorsal side, where, tracing them in the median direction, they l)ecome 

 scarcer and irregularly distributed, and finally disappear at a greater or 

 less distance fn^m the position of the uteri. In the middle regic^n of 

 the dorsal side, many proglottides showed none of them, while in others 

 they were develo[)ed also in this part but in irregular patches com- 

 paratively few in munber. 



The ovary is [)resent to each set of genital ducts. It is a hori- 

 zontally and transversely stretched cellular sti'ing that divides on 



