134 



ILLINOIS BIOLOGICAL MONOGRAPHS 



[422 



Genital cloaca median or slightly displaced towards either side, deep and 

 narrow, separated from hermophroditic duct by a narrow velum, half way 

 between anterior and posterior borders of the proglottis. Vagina opens im- 

 mediately behind cirrus or very slightly to one side. 



Testes ellipsoidal in shape, 64 to 75/x wide, 45 to 60 long, 64 to 80 deep; 

 60 to 70 in number, dorsal in the medulla. Vas deferens closely applied to 

 inner end of cirrus pouch, 85/^ long, 175 wide and 400 thick, somewhat crescen- 

 tic in the dorsoventral-transverse plane, opposite the uterus-sac. Cirrus-sac 

 long and cylindrical, 0.50 by 0.14mm., inner haK deflected towards the vas 

 deferens, walls very thick, composed mostly of circular muscles. Cirrus short, 

 usually not extending outside of the proglottis, 30 to 35/z in diameter. 



Vagina with bulbous sphincter near its opening, 50ju long by 70 in diameter. 

 Ovary irregularly branched but compressed anteroposteriorly, 0.45mm. wide; 

 isthmus only ventral. Oocapt 30/i in diameter. Vitelline follicles extremely 

 numerous, 35^^ long, 60 wide and 85 thick. Vitelline reservoir large, 60^t in 

 diameter. Uterine duct voluminous on both sides of the median line, crowding 

 all other organs. Uterus-sacs alternate irregularly from side to side, each 

 0.45mm. in diameter, encroach greatly on neighboring segments, with thick 

 musculo-glandular funnel-shaped ventral portion. Apertures form two lines 

 on the ventral surface 1mm. apart. 



Eggs 58 by 34//, dark brown, showing thru walls ofuterus-sacs. 



Habitat: Intestine of the host. 



Type specimen: No. 4711, Coll. U. S. National Museum. 

 Co-type: No. 16.461, Collection of the University of Illinois. 

 Type locaUty : " Penekese? " 



Although this species was first described more or less in detail by Linton 

 (1889:456) and further notes were added by the same worker in the following 

 year (1890:728), the writer feels that there is still much to be learned about it 

 in spite of the fact that Ariola (1900:410) was able to indicate the genus to 

 which it belongs and to correct some errors concerning the arrangement of the 



