279] PROTEOCEPHALIDAE—LA RUE 279 



are large, 0.25 mm. in diameter, heavily muscled, and protuberant from 

 the angles of the head. The neck is short but nearly as broad as the 

 head. Fritsch failed to state the proportions of the young proglottids, 

 nor are the latter figured. Mature proglottids are nearly quadrate while 

 ripe ones are somewhat broader than long. Ripe proglottids measure 

 about 1.46 mm. broad by 1.1 mm. long. The genital organs are arranged 

 according to the type of the genus. The marginal genital pore alter- 

 nates from side to side. It is situated near the middle of the proglottid, 

 is of large size and is marked by a considerable thickening of the mar- 

 gin. The cirrus is sometimes protruded and is then short and slender. 

 The cirrus-pouch is relatively small and short. Its length goes into the 

 proglottid breadth about five times. The ductus ejaculatorius forms no 

 coils within the cirrus-pouch. The coils of the vas deferens form a knot 

 extending from the cirrus-pouch to the middle of the proglottid. Testes 

 are irregularly scattered between the vitellaria and the ovary. Fritsch 

 figures about 120 of them. His drawing which is reproduced here (Fig. 

 166) does not show them in the mid-field. This may be explained in 

 three ways: first, that the testes occupy only the lateral fields of the 

 proglottid, second, that the preparation was of such a nature that the 

 testes if present could not be seen on account of the eggs in the uterus, 

 or third, that they were poorly stained. Without having seen the 

 specimens on which Fritsch 's description is based or specimens known 

 to belong to the same lot or from the same host species one is unable to 

 judge on this point. It is well, perhaps, to call attention to the fact 

 that testes in ripe proglottids do not take the stain well nor are they 

 easily seen through the mass of eggs in the uterus. 



The vagina opens posterior to the cirrus-pouch. "Whether it ever 

 opens anterior to the pouch is not stated. There are no coils of the 

 vagina anterior to the ovary. The ovary is bilobed, each lobe being 

 somewhat winglike. It is in the posterior part of the proglottid. The 

 lobes are apparently follicular at the outer ends, tho this feature could 

 not be determined with any accuracy unless an examination of Fritsch 's 

 specimens were made. The vitellaria are long follicular masses in either 

 lateral field. From the drawing the follicles of the vitellaria seem to 

 be compacted rather than widely scattered as in the type of the genus. 

 The uterus is a median tube from which, apparently, many lateral 

 pouches arise. In the drawing by Fritsch these pouches are rather 

 indistinct, but about 18-20 on either side can be seen with some degree 

 of certainty. In the drawing, reproduced (Fig. 166) these structures 

 are made more distinct than in the original. The eggs were not de- 

 scribed by Fritsch. % 



