76 ILLINOIS BIOLOGICAL MONOGRAPHS [426 



Genus Linstowia 



54. Cirrus pouch very large, reaching to the median line of the 



proglottid or nearly so 55 



Cirrus pouch relatively small, not reaching to the lateral excre- 

 tory trunks. Embryos, in ripe proglottids, mostly in lateral 

 portions of the segment 56 



55. Testes about 40, mostly posterior. Host, Perameles obesula, 



Australia. (See Zschokke, 1898.) L. semoni 



Testes about 100, mostly anterior. Host, Echidna hystrix, Aus- 

 tralia. (See Zschokke, 1898.) Tidswell, 1910, has declared 

 Taenia echidnae Thompson 1893 and Taenia phoptica Cob- 

 bold 1879, to be synonyms. ( I have been unable to find this 

 article, or even to learn its title) L echidnae 



56. Number of proglottids, 160 to 200. Genital pore but slightly in 



front of the middle of the proglottid. Ovary of about 8 

 slender lobes, four of which extend towards each lateral mar- 

 gin. Host, Peramys americana, South Americana. (See 



Zschokke, 1904.) L. jheringi 



Number of proglottids, 90. Genital pore very near the anterior 

 end of the margin. Ovary consists of two comparatively 

 compact lobes each with very short, slender, radiating pro- 

 cesses. Host, Didelphys tristriata, Brazil. (See von Jan- 



icki, 1906.) JL. brasilensis 



Genus Zschokkeella (Syn. Zschokkea Fuhrman 1902) 



57. Excretory vessels far medial. Testes about 140, largely outside 



the median field. Host, Numida ptilorhyncha... (See Fuhr- 

 mann, 1902.) _ Z. linstowi 



Testes in median field. Cirrus pouch round, small, one- 

 eighteenth the diameter of the proglottid. Very poorly 

 described. Most of the facts known point to the conclusion 

 that this cestode does not belong in the genus Zschokkeella ; 

 but not enough is known to justify placing it elsewhere. 

 Host, Oprecopithecus pyrrhonotus, West Africa. (See von 

 Linstow, 1905. ) „ Z. remota 



Excretory ducts lateral in position. Testes in two groups, 

 mostly on the side away from the pore. Host, Cricetomus 

 gambianum. (See Beddard, 1911, 1912.) Z. gambianum 



