1914] A New Cestode from Amia Calva L. 115 



common genital anlage, a much-coiled, proximal, thin-walled tube, the 

 uterine tube ("Uteringang"), and a capacious uterus-sac ("Uterus- 

 hohle") which, when gravid, occupies almost the whole of the central 

 portion of the proglottis. The eggs are provided with opercula. 



All of the genital ducts are lined with an epithelium which, on account 

 of cell-boundaries being almost entirely absent, is of the nature of a 

 syncitium. In certain regions, namely, in the cirrus and in the entrance 

 to the vagina, this syncitial epithelium becomes transformed into cuticle 

 with an accompanying migration of its nuclei through the basement- 

 membrane and into the surrounding parenchymal cytoplasm. 



From the foregoing description it is to be seen that, although this 

 species is in most respects a typical Bothriocephalid, its characters are 

 such as to render the placing of it in the existing classification of the 

 families and genera of the order, Pseudophyllidea, a matter of considera- 

 ble difficulty. However, since this subject is dealt with in another 

 paper, as mentioned at the outset, it will be sufficient to state here that, 

 so far as the writer has been able to ascertain, this is a new species of 

 cestode which must also be accommodated in a new genus. Consequently, 

 the following names are proposed: Genus, Haplobothrium {arXovs, 

 simple; ^oOplou, a small hollow or trench); species, globuliforme, 

 {globulus, a bead; forma, shape or form), the significance of which specific 

 name has been referred to above. 



The type-specimen of this species is included in the writer's private 

 collection, while a co-type has been donated to Dr. H. B. Ward of 

 the University of Illinois. 



Biological Department, 



University of Toronto, 

 August, 191 4. 



