On Sticliocotyle nepliropis Cuuniiighnm, a ((iirtisite of tJie American lolister. 471 



narrow right end the oviduct leads forward upon the right side of 

 the median phme, ventrad of the large excretory vesicle of that side. 

 Opposite the anterior sucker the duct broadens out somewhat and just 

 in front of the anterior margin of the sucker makes a bend inward 

 to the mid-ventral line, where it ends. This point, then, indicates 

 the position of the sexual orifice. 



The testes (PI. 2i), Fig. 2 te\ PI. 31, Fig. 23 té) are two rounded 

 masses of tissue lying a short distance caudad from the ovary upon 

 the dorsal side of the excretory vesicles , one upon each side of the 

 intestine. They are not symmetrically placed, the left always being 

 farther forward than its fellow of the opposite side. The ducts (vasa 

 deferentia) are not yet developed in the worms which I have studied. 



The fundament of the viteUary glands and their duct exists 

 as a cord of cells lying in the median plane near the posterior end 

 of the body, midway between the intestine and the dorsal body-wall. 

 Its position is indicated in PI. 81, Fig. 23 gl.vt. Its anterior end 

 may be traced forward as a thin strand of cells, indicated in part of 

 its course by a dotted line passing forward along the right side of 

 the intestine and finally under it to join the oviduct at the point 

 where the latter leaves the ovary. 



From the positions and relations to one another of these several 

 masses of cells, it would seem as though there could be little doubt 

 as to the correctness of the interpretation which I have put upon each 

 of them. Cunningham described the masses of tissue which 1 have 

 called ovary and oviduct, but without either recognizing definitely of 

 what organs they were the fundaments, or determining the position 

 of the pore by which at a later period one of them communicates with 

 the exterior. He neither mentions nor figures the testes or the vitel- 

 lary glands and duct. 



Regarding the histology of these masses of tissue which I have 

 described, there is little to be said. It appears essentially alike in 

 all parts and is composed of deeply staining cells with prominent 

 nuclei, which lie closely crowded together. It can be recognized in 

 the* part which I have called the oviduct that the nuclei are more 

 crowded in the peripheral than in the axial portion — a suggestion 

 of the tubular character which the organ is to assume later. That 

 the relation between these organs and the suckers is not definite may 

 be seen by comparing Figs 3 (PI. 29) and 23 (PI. 31). 



There is no indication in any of my specimens of a Laurer's 

 canal: whether it -develops later, will i)e known only when the adult 



