646 MR. F. E. BEDDARD ON 



common centre, there being thus a likeness to the ovaries. The two 

 glands are likewise united by a bridge of tissue. Both the ovaries 

 and the vitelline glands are in close contact with the walls of the 

 receptaculum seminis. The shell-gland lies again rather doisally 

 to the vitelline glands ; but here the giowth of those glands 

 laterally causes the shell-gland to lie rather between than above 

 the vitelline glands. It is in close relation with the median end 

 of the receptaculum seminis, which does not extend beyond it. 



The sperm-duct in the mature proglottides has a form apparently 

 like that of other species of Bertiella parasitic in Monkeys, and is 

 not to be distinguished, so far as I can see, from that of Bertiella 

 mucronata. The sperm-duct is of considerable width from the very 

 first, i. e. where it emerges from the cirrus sac. It is probable, how- 

 ever, that this region is really to be looked upon as representing 

 the vesicula seminalis of other Oestodes. A part of this dilated 

 sperm-duct lies actually within the cirrus sac as is depicted for 

 Bertiella polyoi^chis by v. Linstow. This portion, which is quite 

 short, is wider than the section which follows. The latter, however, 

 is also wide and lies in pretty regular coils of three alongside the 

 vagina as far as the commencement of the wide receptaculum 

 seminis. It is gorged with sperm and its walls are thin, but very 

 plainly recognisable by their dark staining. The coiling com- 

 mences directly after the emergence of the sperm-duct from the 

 cirrus sac, and we have therefoi-e here a coiled region of the 

 sperm-duct which cori-esponds to that chai'acteristic of many othei- 

 Tapeworms, but with the addition that it is the vesicula seminalis 

 part of the sperm-duct which is coiled. 



The sperm-duct appeal's to come to abrupt conclusion at about 

 the commencement of the wide i-eceptaculum seminis. But in 

 favourable sections it may be traced further as a very slender 

 tube closely adherent to the ventral wall of the receptaculum. 

 In the posterior segments of the body, which are distended 

 with ova, the sperm-ducts do not degenerate ; on the contrary, 

 they are somewhat largei' than in the first mature segment. They 

 contain, moreovei-, more sperm, which has somewhat distended 

 them : the walls thus appear thinner. The ducts in this region 

 of the body lie quite as coiled as in the more anterior proglottides ; 

 it might be supposed that they would be straightened out by the 

 tension caused by the enclosed spermatozoa. Nor has the sperm- 

 duct in any way shifted from the normal position, lying, as it does, 

 alongside of, and in close contact with, the vagina, which has under- 

 gone in this legion of the body considerably greater alterations. 

 The same triple ari-angement of the coils is visible — that is to say, 

 in a given transverse section there are usually three tubes to be 

 seen, this being, of course, the expression of the coiling. 



The vagina of this species is specialised into several regions, as 

 it is shown to be in B. mucronata and B. conferta in the figures 

 of Meyner. The proglottides, from an examination of which I 

 have compiled the following description, appear to be in much 

 the same stage of sexual development as those figured by 



