NO. 1105. PROCEEDINGS OF THE NATIONAL MUSEUM. 229 



PLATE XI. 

 Cittotamia marmotce, from the Alpine Marmot (Arctomys marmota). 



FIG. 1. Strobila, natural size. 



2-4. Three views of head. Zeiss, 4-a* 10. 



5. Enlarged dorsal view of strobila, mounted whole, showing internal anat- 



omy. No.l370,U.S.N.M. 



Attention should be directed to the sudden development and equally 

 sudden atrophy of the ovarian tubules, to the lateral growth between 

 the ovary and lateral canal, and to the form of the uterus and the cirrus- 

 pouch. 



6. Diagrammatic transverse section of segment to show topographical anat- 

 4 omy : P., cirrus ; V., vagina ; N., nerve ; D. C., dorsal canal ; V. C., ven- 

 tral canal. 



7-8. Two greatly enlarged figures, dorsal view, showing anatomy of segments. 

 Fig. 7 after Stiles (in Stiles & Hassall, 1893, PI. VII, fig. 6). 



All figures were prepared from specimens collected at Briancon, France, 

 by R. Blanchard. 



Drawn by Haines. 



PLATE XII. 

 Cittotcenia marmotce and Cittotcenia denticulata. 



FIGS. 1-2. Cittotcenia marmotce, from the Alpine Marmot (Arctomys marmotce). 



1. Dorsal view of gravid segment. Zeiss, 4-a* 10. 



2. Oncosphere in the pyriform apparatus, escaping from the outer eggshell. 



Greatly enlarged. 

 3-8. Cittotcenia denticulata, from European Wild Rabbit (Lepus cuniculus). 



3. Strobila, natural size. No. 1328, U.S.N.M., one of Riehm's cotypes of 



Dipylidium latissimum. For figures of Rudolphi's cotypes of Tcenia den- 

 ticulata see Stiles (in Stiles & Hassall, 1893, PI. V, figs. 4-7). 



4. Head and anterior portion. After Riehm, 1881, Pl.V, fig. 5. 



5. Lateral border of segments showing the gradual development of the 



cirrus. The numbers refer to the segments. After R. Blanchard, 1891B, 

 fig. 22. 



6. Injected excretory system. After Riehm, 1881, PL V, fig. 15. 



7. Transverse section (diagrammatic) of segment to show topographical 



anatomy. Testicles are dorsal, accessory excretory canals ventral. 



8. Ventral view of segment, showing cirrus, cirrus-pouch, vas deferens, 



testicles, ovaries, vitellogene glands, vagina, dorsal and larger ventral 

 canals. No. 1328b, U.S.N.M. Zeiss, 4-a* 10. 

 Drawn by Haines. 



PLATE XIII. 



Cittotcenia denticulata, from the European Wild Rabbit (Lepus cuniculus). 

 FIG. 1. Half of segment to show the anatomy: re., retractor muscle of the cirrus- 

 pouch; v. d., vas deferens; p., prostata; r m"., inner layer of circular 

 muscles of the cirrus-pouch; 7m., longitudinal muscles; rm'., outer 

 layer of circular muscles; sp., spongy connective tissue; c., cirrus; 

 v., vagina; n., longitudinal nerve; a?., dorsal canal; #., ventral canal 

 system; rs., receptaculum seminis; d., vitellogene gland; ., shell- 

 gland ; e., ovary ; u., uterus ; t., testicles. After Riehm, 1881, PL VI, fig. 2. 

 The topography is not well preserved, but this is probably a dorsal 

 view, as is shown by the position of the dorsal canal. If this interpre- 

 tation is correct, the vagina and vas deferens should run over the canals 

 and nerves instead of under, as given in the figure. See PL XII, fig. 7. 



