68 ILLINOIS BIOLOGICAL MONOGRAPHS [418 



20. Length, 50 to 60 cm. Several thousand proglottids. Testes 



about 200, reaching the distal limit of the proglottid. 

 Ovary lying one-third beyond the median line of the pro- 

 glottid. Host, Phascolarctus cinerus, Australia. (See 

 Zschokke, 1898. ) B. obesa 



Length, 66 cm. Number of proglottids, up to 1500. Testes 

 fewer than in B. sarsinorum, extending nearly to the pos- 

 terior limit of the proglottid. Ovary reaching just to the 

 median line of the proglottid. Host, Phalanger ursinus, 

 Australia and vicinity. (See Zschokke, 1899.)- B. edulis 



Length, 7 cm. Number of proglottids, 220. Testes 30 to 40, 

 mostly in a single row at the anterior end of the proglottid. 

 Ovary distant by nearly half its width from the median 

 line of the proglottid. Host, Phalanger ursinus, Australia 

 and vicinity. (See Zschokke, 1899.) B. sarsinorum 



Genus Anoplocephala (Syn. : Plagiotaenia) 



More than half the species placed in this genus are poorly 

 known, and the statements made are often not dependable ; 

 some of the species probably do not exist, and others prob- 

 ably belong even in other families. For this reason, a log- 

 ical key is out of the question, and no attempt has been 

 made to make one; the following arbitrary division is 

 made. 



21. At least fairly well known species, generic position assured „ 22 



Improperly described, position not assured 27 



22. Cirrus pouch enormous, 0.8 mm. or more long, lying mostly 



within the excretory ducts 23 



Cirrus pouch ordinarily not over 0.3 mm. long, more than half 

 of it lying outside the excretory ducts 24 



23. Length, 25 to 40 mm. Number of proglottids, 30 to 40. Sexual 



maturity reached in 10th or 12th proglottid. Receptacu- 

 lum seminis globular, small. Host, Tapirus americanus, 

 Brazil. Not fully known anatomically; all points known 

 are essentially in agreement with the next species. (See 



Luhe, 1895.) A., globiceps 



Length, 10 mm. Number of proglottids, 10 to 28. Sexual matu- 

 rity reached in eighth or ninth proglottid. Receptaculum 

 seminis large and oblong, mostly ventral to cirrus pouch. 

 Cirrus not spiny. Ovary not bilobed. Hosts, Lepus cunicu- 

 lus and Lepus variabilis, France. (See present paper.) 



A. wimerosa 



