198 



PL A THELMINTHES 



Fig. 320— Ante- 

 rior end of Anoplo- 

 cephala perfoUata 

 (Ward). 



1. Anoplocephala Blanchaicl. Segments niiicli broader than long; 

 genital pores all on the same side of the segments and never on both 

 sides: about 16 species; in hoi-ses and rodents. 



A. perfoliata (Goeze) (Fig. 320). Length up to 8 

 em. ; seolex large, square, with 4 projections extending 

 backwards, 2 being dorsal and 2 ventral : in the ileum, 

 caecum, and colon of the horse, often in large numbers. 

 2. Bertia Blanchard. Segments broader than 

 long; genital pores regularly or irregularly alternate, 

 but never on both sides of a segment: in apes, mon- 

 keys, and rodents; about 6 species. 



B. americana (Stiles). Length 33 mm.; width 6 mm.; with about 

 90 segments; no calcareous concretions: in porcupines; often common. 



3. CiTTOT^NlA* Riehm. Segments 

 broader than long with genital pores on 

 both sides ; 2 sets of genital organs and 1 or 

 in some cases 2 simple, transverse, tubular 

 uteri in each segment ; vagina always ven- 

 tral to the cirrus: in rodents; 7 species. 



C. variabilis (Stiles) (Fig. 321). 

 Leng-th up to 18 cm.; breadth 10 mm.; 

 cirrus pouch tubular, of equal diameter 

 throughout; testes form a band in the 

 median area between the ovaries: in the 

 cotton-tail rabbit and the marsh hare. 



4. MoNiEZiAf Blanchard. Segments broader than long with genital 

 pores on both sides; 2 sets of genital organs and 2 complex reticulate 

 uteri in each segment; vagina ventral on right side and dorsal on left 

 side to cirms; interproglottidal glands along hinder 

 margin of the segment: 6 species; in ruminants. 



f] 



Fig. 321 — Cittotwnia variabilis 

 (Stiles). A, head; B, a seg- 

 ment. 1, excretory canals ; 2, 

 ovary ; 3, testes. 



-Moniezia planissima (Stiles). A, a segment; B, head. 1, 

 2, ovary ; 3, yolk gland ; 4, interproglottidal gland. 



a 



genital pore ; 



M. planissima Stiles and Hassall (Fig. 322). Body very broad and 

 flat and up to 2 m. long, and 26 mm. broad; interproglottidal glands 



* See "Studies on the Genus Cittotaenia," hy R. A. Lyman, Stud, from Zool. 

 Lab.. TTniv. of Neb., No. 48, 1902. 



t See "A Revision of the Adult Cestodes of Cattle, Sheep," etc., by C. W. Stiles 

 and A. Hassall, Bull. No. 4, Bur. Animal Ind., 1893. 



