230 TAPEWORMS OF HARES AND RABBITS STILES. VOL.XIX. 



FlG. 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 Dlpy- 

 lidium latissimum. 



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

 After R. Blanchard, 1891B, fig. 25. 

 Drawn by Haines. 



PLATE XIV. 

 Cittotcenia ctenoides, from European Wild Rabbit (Lepus cuniculus). 



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 Riehm, 1881, PL 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; v s., vesicula 



seminalis; c&., cirrus-pouch; v., vagina; u., uterus; n., nerve; x., dor- 

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

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

 After Riehm, 1881, PI. VI, fig. 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 vaginae, and two cirrus-pouches. 



Drawn by Haines. 



PLATE XV. 

 Cittotcenia prcecoquis, from the Prairie Gopher (Geomys lursarius}. 



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

 the organs. No. 1079, U.S.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 be directed to the very large receptaculum seminis. 



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



trad and the uterus is absent in the median line. 

 Drawn by Haines. 



PLATE XVI. 

 Cittotcenia pectinata, from European Mountain Hare (Lepus variaUlis). 



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. Blanchard in France. 

 Drawn by Haines. 



PLATE XVII. 



Cittotcenia pectinata, from European Mountain Hare (Lepus variabilis) and European 



Hare (Lepus timidus). 



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 (Lepus timidus). 

 Drawn by Haines. 



