T^NIOID CESTODES OF NORTH AMERICAlSr BIRDS. 65 



and passes forward outside of and parallel with the latter. Eggs 

 with two shells without pyriform apparatus. Adults in birds. 

 Type-species. — Aporina alba Fuhrmann, 1902. 



Subfamily LIlSrSTO^^IN'.^E I^uhrmaian, 1907. 



Subfamily diagnosis. — Anoplocephalidas : A single set of reproduc- 

 tive organs in each segment. Uterus breaks down into egg capsules. 

 Adults in mammals and birds. 



Type-genus. — Linstowia Zschokke, 1898. 



Genus LINSTOW^IA Zschokke, 1898. 



Generic diagnosis. — Linstowinse: Segments broader than long. 

 Cortical parenchyma greatly increased in thickness, medullary par- 

 enchyma correspondingly reduced. Dorsal longitudinal excretory 

 vessels along the outer side of the ventral vessels. Genital pores 

 alternate. Genital canals pass ventral of the excretory vessels and 

 nerve. Testicles dorsal, scattered throughout the entire length of the 

 segment. Female glands submedian, only slightly displaced toward 

 the pore side of the segment. Uterus a thin-w^alled folded tube, dis- 

 appearing early, the eggs becoming inclosed singly in egg capsules. 

 Eggs without pyriform apparatus. Adults in monotremes and mar- 

 supials. 



Type-species. — Taenia echidnm W. ThomjDson, 1893. 



Genus ZSCHOKKEELLA, ne^A^ name. 



Linstowia (in part) (see Fuhrmann, 19021, p. 138). 

 ZschoJcTcia ° Fuhrmann, 1902. 



Zschokkea * Fuhrmann, 1902 (homonymous with Zschokkea Koenike, 1892,*' 

 a genus of mites). 



Generic diagnosis. — Linstowinse : Segments much broader than 

 long. Cortical parenchyma and musculature greatly developed. Dor- 

 sal excretory vessel lateral of ventral vessel. A fine capillary network 

 in the periphery of the cortical parenchyma connects all four excre- 

 tory vessels. Genital pores unilateral. Genital canals pass dorsal of 

 the nerve, and ventral of the dorsal excretory vessel. Cirrus pouch 

 weakly developed. Testicles dorsal scattered through the entire 

 length of the segment. Female reproductive glands toward pore side 

 of the segment between dorsal and ventral excretory vessels. Uterus 

 early breaks down into egg capsules. Adults in birds. 



Type-species. — Zschokkeella linstowii (Parona, 1885). 



"■ Fuhrmann, 1902i, p. 138, apparently a misprint for Zschokkea. 

 & Fuhrmann, 1902i, p. 140. 

 cZooI. Anz., vol. 15, pp. 320-321. 



3264— Bull. 69—09 5 



