78 ILLINOIS BIOLOGICAL MONOGRAPHS [428 



Cirrus pouch 270 /x long. Host, Hyrax sp., East Africa. (See 

 Bischoff , 1912. ) /. apospasmation 



67. 20 to 70 proglottids. Host, Procavia sp., South Africa. (See 



von Janicki, 1910. ) I. settii 



12 to 15 proglottids. Host, Hyrax sp., Rikwasee. (See Bisch- 

 off, 1912.) I. lopas 



Genus Thysanotaenia 



68. Female glands near the median line of the proglottid. No dor- 



sal excretory duct. Host, Lemur macaco. (See Beddard, 

 1911b, 1912.) T. lemuris 



Genus Hyracotaenia 



69. Ovary entirely, or partly laterad of ventral excretory duct. 



Vitelline gland dorsal. Host, Procavia capensis. (See Bed- 

 dard, 1912. ) H . procaviae 



Ovary entirely mediad of excretory ducts. Vitelline gland ven- 

 tral. Host, Procavia capensis. (See Beddard, 1912.) _ 



H. hyracis 



Thysanosominae 



Genus Thysanosoma 



70. Length, 15 to 30 cm. Two sets of reproductive organs. Testes 



in median field. Posterior flap of segments fimbriate. With 

 pyriform body, which has no horns. Reported from several 

 species of Cervus, Cariacus, Bos & Ovis. (See Stiles & 

 Hassall, 1893.) T. actinioides 



Length, 1 to 2 m. Seldom more than one set of reproductive 

 organs to the proglqttid, pores alternating irregularly. 

 Testes in lateral fields. Posterior flap of segments fimbri- 

 ate. With pyriform apparatus which has no horns. Hosts, 

 Ovis, Bos, and Sus. (See Stiles & Hassall, 1893.) T. giardi 



Length, 1.5 m. Strobilization not distinct. Genital pores alter- 

 nating rather regularly. No pyriform apparatus. Host, 

 Capreolus pygardus, Siberia. Description unsatisfactory. 

 ( See Kholodskovi, 1902. ) T. pygardi 



AVITELLININAE 



71. Uterus single ; a single paruterine organ. Testes in four groups. 



Genital canals pass dorsally of both excretory ducts _ 



Avitellina 72 

 Uterus double; two paruterine organs. Testes in two groups. 

 Genital canals pass between excretory canals Stilesia 73 



