'230 TAPEWORMS OF HARES AND RABBITS— STILES. 



Fig. 2. Ventral view of gravid segment. The peculiar folds of the uterus should 

 attract attention. No. 328f, U.S.N.M., one of Riehm's cotypes of Dijty- 

 lidium latinHinium. 

 3a-h. Oncosphere, pyriforni body, and middle and outer envelopes of the eggs. 

 After 11. lilanchard, 1891B, iig. 25. 

 Drawn by Haines. 



Plate XIV. 



Cittotania ctenoidcs, from European Wild Rabbit {Leints cmiculus). 



Fig. 1. Strobila, natural size, from one of Riehm's original specimens. 



2. Head. Zeiss, 4-a * 10. 



3. Head with dorsal and ventral excretory canals. After Riehra, 1881, PI. V 



fig. 13. 



4. Posterior segments with injected excretory system. After Riehm, 1881, PI. 



V, fig. 16. 



5. Half of segment to show the anatomy: v d., vas deferens; r s., vesicnla 



seminalis; c&., cirrus-pouch; r., vagina; «., uterus; «., nerve; x., dor- 

 sal canal; E., ventral canal with transverse canal; s., shell-gland; d., 

 vitellogene gland; t., testicles; e., ovary; r.s., receptaculum seminis. 

 After Riehm, 1881, PL VI, tig. 5. 



It is not clear whether this is a dorsal or ventral view ; probably it is 

 intended as dorsal ; for correct topography see fig. 7. 



6. Diagrammatic transverse section of segment; dorsal canal dorsal (in some 



"segments dorso-lateral) of ventral canal ; genital canals pass dorsally of 

 nerve and longitudinal canals. 



7. Segments showing position of the testicles. No. 1329a, U.S.N.M., from the 



domesticated rabbit. Zeiss, 4-a* 10. 



8. A gravid segment showing uterus, two vagina?, and two cirrus-pouches. 



Drawn by Haines. 



Plate XV, 

 Cittotcenia jmvcoquis, from the Prairie Gopher {Geomijs hursarius). 

 Figs. 1-2. Anterior portion of strobila (divided), showing the rapid development of 

 the organs. No. 1079, U.8.N.M. Zeiss, 4-a* 10. 



3. Three segments more highly magnified. No. 1079, U.S.N.M. Zeiss, 4-16. 



4. Older segment. No. 1079, U.S.N.M. Zeiss, 4-16. 



5. Transverse section of gravid segment at the pores, to show the anatomy. 



Attention should 1)0 directed to the very large receptaculum seminis. 



6. Transverse section in another plane. The testiclea extend further ven- 



trad and the uterus is absent in the median line. 

 Drawn by Haines. 



Plate XVI. 



Cittoto'nia pectinata, from European Mountain Hare (Lejnis variaMJis). 



Figs. 1-2. Enlarged view of strobila showing the gradual development of all of 



the organs. Ventral view. Specimen No. , U.S.N.M., collected by 



R. Blauchard in France. 

 Drawn by Haines. 



Plate XVII. 



Cittotania pectinata, from European Mountain Hare (Lcpits rariabilis) and European 



Hare {Lepus timidiis). 

 Fig. 1. Continuation of Plate XVI, figs. 1-2, a few contracted segments omitted. 



2. Strobila, natural size. One of Riehm's original specimens from the Euro- 

 pean Hare (Lepns timidits). 

 Drawn by Haines. 



