393] ANOPLOCEPHALIDJE— DOUTHITT 43 



The genus Schizotaenia embraces the following well described 



species. 



Magna group : Genital pores dextral. Testes mostly anterior and 



mostly on the pore side. Size of known species enormous. 

 8. laiissima Deiner 8. gigantea Peters 



Hagmanni group : Genital pores alternate. Testes posterior. 



Known species small. 



8. hagmanni von Janicki 8. variabilis Douthitt 



S. americana Stiles 8. anoplocephaloides Douthitt 



"Schizotaenia'''' decrescens (Diesing 1856) Liihe 1895, which von 



Janicki unfortunately designated as the type of the genus, seems to 



belong to this group and should be treated as such until better known. 



' :t Anoplocephala" transversaria shows some of the characteristics of this 



group but not enough information is accessible to justify a change of 



position. 



THE UTERUS OF MONIEZIA EXPANSA 



The cestodes of the genus Moniezia have received more attention 

 than those of any other genus of the family. As a result of the studies 

 of Stiles and Hassall, Tower, Fuhrmann, and a number of other work- 

 ers, most of the points of anatomy have been determined carefully. 

 Strangely enough, however, practically no attention has been given to 

 the uterus except to observe that it begins usually as a reticulum; one 

 is left to assume that the later development is not different from that 

 of related forms. My own observations however have tended to show 

 that the development of the uterus is in many ways unique and fur- 

 nishes hints as to the relationship of the genus. I had for study several 

 specimens of Moniezia expansa, taken from sheep at Lincoln, Nebraska, 

 and belonging to the collection of Professor Henry B. Ward. No ob- 

 servations at variance with accepted anatomical accounts were made 

 so structures other than the uterus have not been taken up, except that 

 a drawing of a mature proglottid is included for comparison (Fig. 41). 



The uterus in Moniezia expansa begins as a reticulum (Fig. 42), 

 whose slender branches are quite distinct and lie at a considerable 

 distance from each other. In extends nearly the whole length of the 

 proglottid in the space that lies between the shell glands. Beyond 

 these glands on either side two branches, occurring respectively in the 

 anterior one-third and the posterior one-third of the proglottid, extend 

 laterad to beyond the excretory ducts on the dorsal side of the latter. 

 Upon the entrance of the eggs the cavities of the various branches of 

 the uterus enlarge somewhat. The eggs come to lie in bunches which 

 are distributed equally to different parts of the proglottid. As the 



