429] ANOPLOCEPHALIDAE— DOUTHITT 79 



Genus Avitellina 



72. Length, 2 or 3 meters. Host, Ovis aries, Africa, Italy. (See 



Gough, 1911. ) A. centripunctata 



Genus Stilesia 



73. Testes mostly median or dorsal to the ventral canal. Hosts, 



ruminants, Africa. (See Gough, 1911.) S. hepatica 



Testes all lateral to the ventral canal 74 



74. Vas deferens forms a dense packet of convolutions (functionally 



a vesicula seminalis) between nerve and ventral canal be- 

 fore reaching cirrus pouch. Host, Camelus dromedarius, 



India and Algiers. (See Gough, 1911.) 8. vittata 



Vas deferens forms at most 3 or 4 loose convolutions between 

 the nerve and ventral canal, before reaching the cirrus 

 pouch. Hosts, Ovis & Capra, Europe and India. (See 

 Gough, 1911.) S. globipuncta 



SUMMARY AND CONCLUSIONS 



1. The cestodes of the subfamily Anoplocephalinae are in some 

 way dependant upon rich soils for their existence and they thrive best 

 in wet lowlands. The evidence points to the conclusion that the inter- 

 mediate hosts are some group of insects which is confined to such regions ; 

 and since the hosts of the Anoplocephalidae are almost exclusively 

 herbivorous, it would seem as if this host were a small, plant-feeding 

 insect. 



2. The primitive Anoplocephaline uterus was of the reticulate type, 

 which in turn was derived from a median longitudinal tubular uterus by 

 lateral outgrowths. The transverse tubular and diffuse uteri of this 

 group have been derived from the reticular by simplification. 



3. In the early primitive Anoplocephalidae the uterus crossed the 

 excretory ducts ventrally ; subsequently it became restricted to the 

 median field and later came to cross the excretory ducts dorsally. 



4. The position of the vaginal pore and vagina is one of the most 

 stable anatomical characters of the Anoplocephalinae and should be 

 given recognition as one of the most important criteria of relationship. 

 The primitive position of the vagina was posterior to the cirrus pouch. 



5. The more generalized representatives of the genus Andrya ap- 

 proach the nearest of all known Anoplocephalidae to the ancestral types 

 of the family. Leaving out of consideration the aberrant Triplotaenia, 



