NO. 1105. PROCEEDINGS OF THE NATION'AL MUSEUM. 231 



Plate XVIII. 



Cittotnmia perplexa, from the Cottontail Rabbit {Lepus si/lvaticHs). 

 Fig. 1. Strobila with head, natural size. No. 112G. U.S.N.M. 



2. Anterior portion of strobila enlarged to show the general appearance No 



1138, U.S.N.M. Zeiss, 4-a*5. 



3. Ventral view of a single segment, showing nerves, canals, cirrus-pouch, vasa 



deferentia, testich'S arranged in two groups, single uterus, two ovaries 

 and vitellogene glands. No. 1131, U.S.N.M. 

 Drawn by Haines. 



Plato XIX. 



Cittoimna variabilis; Cittotwnia rariabilis anffiista. 



Figs. 1-12. Cittotwnia variabilis, from the Cottontail Rabbit (Zej>«s sylvaticus). 

 1. Strobila, natural size. 

 2-7. Six views of heads. 



8. Very young specimen. 



9. Very young specimen with beginning segmentation. No. 1373.7, U.S.N.M. 



10. Ventral view of segment in which uterus is not developed. No 1162 



U.S.N.M. Zeiss, 4-a* 10. ' ' 



11. Ventral view of segment with single uterus. No. 1207, U.S.N M Zeiss 



4-a'' 10. 



12. Ventral view of segment with two uteri, only one of which is well 



developed. No. 1162, U.S.N.M. Zeiss, 4-a* 10. 

 13-14. Cittotd-nia variabilis angiisfa, from the Cottontail Rabbit (Lepus si/lvaticiis). 

 Two strobila?, natural size. For a figure of segments from fig. 14 (No. 

 119, U.S.N.M.), showing both double and single genital pores, see Stiles. 

 1895. 

 Drawn by Haines. 



Plate XX. 

 Cittotwnia rariabilis, from the Cottontail Rabbit (Lepns sylraticus). 

 Figs. 1-5. Segments showing variations. All ventral views, except fig 1. Nos. 1154, 

 1122, 1125, 1127, 1152, U.S.N.M. Enlarged about 15 times. "^ Zeiss, 4-a* lo! 

 Drawn by Haines. 



Plate XXI. 

 Davainea rctractilis, from the Arizona Cottontail Rabbit (Lejnts arizotiw). 

 Fig. 1. Head enlarged. No. 1195, U.S.N.M. Zeiss, 4-16. 



2. Retracted sucker of same, greatly enlarged. 



3. Segments showing unilateral pores, longitudinal nerves and canals, and 



median female anlage. No. 1192, U.S.N.M. Zeiss, 4-16. 



4. Older segments of same strobila, showing testicles. 



5. Gravid segment showing one egg in each egg capsule. No. 1188, U.S.N.M. 



6. Egg capsule with egg. 



Drawn by Haines from poorly preserved specimens. 



Plate XXII. 

 Davainea retract His; Davainea contorta; Davainea salmoni. 

 Fig. 1. Davainea retractilis, from the Arizona Cottontail Rabbit (Lepus arizonw). 

 Transverse section through gravid segment. Zeiss. 4-16. 

 2. Segment of Darainea contorta, from the Common Indian Pangolin (Man's 

 pentadactijla): /;., testicle; «., uterus: t;e., vas efferens; t'<Z., vas deferens; 

 cU, cirrus; v., vagina; Ic., ovary; d., vitellogene gland. After Zschokke, 

 1895, fig. 2. 



