600 DR. F. E. BEDDARD ON 



in a single complete transverse series. There are thus altogether 

 two or three hundred of these gonads to each mature proglottid. 

 In more immature segments the testes did not appear to extend 

 to the pore side of the longitudinal water-vessels but to stop 

 short before quite reaching the median side of those vessels. In 

 a mature segment I found that 44 out of the 50 sections which 

 displayed it in its entirety were occupied by the testes, which thus 

 fill up most of the segment, though the proportions were not always 

 exactly as stated in the above instance. In proglottids from the 

 other example of this species 3 sections without testes were fol- 

 lowed by 15 sections showing testes, and these again by 5 without 

 testes, and thereafter 14 with testes. It is therefore obviously the 

 case that the testes occupy a great deal of the segments. 



It will be observed that there is no grouping of the testes into 

 two masses such as I have described in Inerinicapsifer capensis. 

 They lie mainly behind the ovary and vitelline gland, and in some 

 proglottids the ovary lay rather more distinctly in front of the male 

 gonads. The testes are more or less spherical or egg-shaped, and 

 when ripe are seen to be suri-ounded by a layer of spermatozoa, 

 which lie therefore, as I take it, in a cavity surrounding the 

 testis, a ccelomic cavity. I never found the testes of this tape- 

 worm to be pear-shaped, like those of Inermicapsifer. Further- 

 more, the testes, all of them, lie dispersed in quite unaltered 

 parenchyma. As is very generally the case among the members 

 of this group, the testes were mature much more anteriorly in the 

 body to the ovary. It is, indeed, a striking feature of the present 

 species, and one in which it contrasts, for example, with the 

 species of Inermicapsifer that has just been described, that the 

 mature testes occupy so many segments of the body, while the 

 mature ovaries are so exceedingly limited in the number of seg- 

 ments in which they are found. The efferent tubules which 

 collect the sperm form a very definite network (see text-fig. 83), 

 which is copious and formed often of unequally sized vessels. A 

 similar network has been described in other tapeworms, for 

 example in Chapmannia* . 



The vas deferens of this species (text-fig. 82, p. 597) is quite dif- 

 ferent from that of the species which we have already considered. 

 The reticulate efferent ducts finally find their way into a large sac, 

 which in the mature segments is stuffed with sperm, and which lies 

 in the female generative mass alongside of the receptaculum 

 ovorum. This large vesicula seminalis is flask-shaped, and there- 

 fore gradually narrows and emerges from the female generative 

 mass as it passes towards the genital orifice. It is impossible to 

 draw a hard-and-fast line between the vesicula seminalis and the 

 sperm-duct proper with which it is continuous, for the gradual 

 diminution in calibre of the entire tube forbids such a delimitation 

 The tube pursues a winding course, narrowing gradually and but 

 slightly ; it never forms an actual coil like the sperm-duct of so 



* See Fubnnann, Swedish Zool. Exped. Egj'pt, 1909, pt. iii, 



