232 TAPEWORMS OF HAEES AND RABBITS STILES. VOL.XIX. 



FIGS. 3-4. Davainea salmoni, from the Cottontail Rabbit (Lepus sylvaticus). 



3. Longitudinal section through very young specimen, showing therostellum 



with hooks and four longitudinal canals. Zeiss, 4-8. 



4. Gravid segment, dorsal view, showing longitudinal nerve and canals, cir- 



rus pouch, vas deferens, vagina, and numerous egg capsules. No. 1104, 

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

 Drawn by Haines. 



PLATE XXIII. 



Davainea salmoni, from the Cottontail Rabbit (Lepus sylvaticus) and the Eastern 

 Jackass Hare (Lepus melanotis). 



FIG. 1. Strobila, natural size. 



2-5. Four views of head. Alcohol specimens. Enlarged about 15 times. Zeiss, 

 4-a* 10. 



6. A portion of the double row of hooks on the rostellum. Greatly enlarged. 



7. View of hooks on the suckers in somewhat contracted condition. Greatly 



enlarged. 



8. Another view of hooks on the suckers. No. 1428, B.A.I. 



9. Egg capsule with 5 eggs. Zeiss, 4-4. 



Drawn by Haines. 



PLATE XXIV. 

 Davainea salmoni, from the Eastern Jackass Hare (Lepus melanotis). 



FIGS. 1-2. Dorsal view of segments in different stages, showing longitudinal nerves 

 and canals, cirrus-pouch, vas deferens, testicles, vagina, and ieuiale 

 glands. No. 1196, U.S.N.M. Zeiss, 4-16. 

 Drawn by Haiues. 



PLATE XXV. 

 Davainea salmoni, from the Cottontail Rabbit (Lepus sylvaticus). 



FIGS. 1-11. Various young stages found in the intestine of the Cottontail Rabbit 

 (Lepus sylvaticus). None of the forms show segmentation, but several 

 figures show the surrounding membrane, evidently pointing to a recent 

 infection. 



