1052 _ DR. F. E, BEDDARD ON 
the sexual organs is as in my species. The drawing * showing this 
alternation does not clearly represent the female ducts; but they 
are shown in a figure of a transverse section T. | infer them to 
be present in “ Bertia americana,” though no particular and de- 
tailed mention of them is made in the text. The shape of the 
uterus, however, and the extreme narrowness of the segments, 
are sufficient to prevent any confusion between the two species. 
Tenia pectinata, described by Cobbold = from the same animal, is 
Text-figure 9. 
Monecocestus erethizontis. 
Horizontal section showing the retiform uterus (wt.). 
r.s. Receptaculum seminis. w.v. Water-vascular vessel. 
too imperfectly known to permit of a comparison ; moreover, it 
has unilateral genital pores, which are fatal to such a comparison. 
The question may arise—are not my specimens perhaps 
abnormal ?@ Von Janicki§$ has lately directed attention to two 
species of Hymenolepis in which the genital pores are absent ; 
and at the same time Wolffhiigel || has made similar observations 
upon a species of Bertiella. These facts are applied by v. Janicki 
* Stiles, loc. cit. pl. x. fig. 7. + Stiles, Joc. cit. pl. x. fig. 9. 
- t Can. Nat. & Geol. vii. 1862, p. 394. ; hey 
§ CB. Bakt. u. Paras. xxxvi. 1904, p. 222. 
|| Berliner tierairztl. Wochenschr. 1904 (quoted by v. Janicki and Fuhrmann). 
