386 G- A. and W. G. MacCallum, 



ovaricus" or "Schluckapparat". It. resembles very closely that de- 

 scribed in Taenia coryphicephala and is composed of a muscular radiating- 

 wall. After leaving- tlüs spliincter tlie oviduct is joined by a short 

 Wide tube which com es from a large club-shaped sac whicli extends 

 far toward tlie genital margin. This sac is tliin-walled. without 

 musculature, and is completely filled witli spermatozoa among which 

 there are numeroiis, red staining, crystalliue bodies. It has a peculiar 

 shape, being at its distal extremity rather narrow and tubulär; but 

 as it approaches the ovary, becoming somewhat pear-shaped and 

 turning ventrally upon itself to end in a point from which runs the 

 duct just described to join the oviduct. Its blind distal extremity 

 shows a thickening of the wall and a radial arrangement of paren- 

 chyma fibers from its end. It lies in a line with the spermatozoon- 

 filled sac just described on the margin, but it terminates uniformly 

 in every segment at a point at about the middle of the cirrus sac 

 to which it runs parallel. The idea imposes itself at once, in spite 

 of the dilatation of the proximal portion or perhaps on account of 

 this dilatation which corresponds so exactly with the receptaculum 

 seminis of many forms, that this must be the vagina which in this 

 instance has become obliterated toward the distal portion throughout 

 a Short part of its course. In other words, it seems possible that 

 in the still younger segments it was continuous with the marginal 

 sac and in that way formed a typical vagina ; but that after fertili- 

 zation atresia took place throughout the distal portion, occasionally 

 leaving the extreme distal portion open to the outside while the 

 more central part becomes shut oif into a receptaculum seminis 

 proper. 



The duct formed by the combination of the oviduct and the 

 Channel from the receptaculum passes dorsalward and becomes 

 surrounded by a compact niass of elongated cells, radially arranged, 

 which constitute the shell gland. In its passage through this niass 

 it receives the duct from the vitellarium or yolk gland which is itself 

 formed by the union of two common ducts which come from the 

 lobulated gland. The vitellarium forms a lobulated mass which lies 

 at the extreme posterior margin of the proglottis and spreads out 

 laterally on each side of the shell gland. Its lobules are extremely 

 delicate and thin-walled and are composed of a mass of cell-like, 

 spherical globules which are highly refractive and pinkstaining, on 

 the outer margin of each of which a nuclear-staining mass is 



