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



FIG. 2. Strobila with head. After R. Blauchard, 1891A, fig. 2. 



3. Three specimens of the pyriform body of the egg. After R. Blanchard, 



1891A, fig. 4. 

 4-5. Bertia mucronata, from the Black Howler (Alouatta caraya}. 



4. Tranverse section of segment at genital pore: H. N., lateral nerve trunk; 



N. N., ventral accessory lateral nerve ; Ex. H., ventral canal ; Ex. N., dor- 

 sal canal; Ut., uterus; Mi. S., middle layer; R. S., cortical layer; M.tr., 

 transverse muscles; M. L, transverse section of longitudinal muscles; 

 Ov.j ovary; Ds., vitellogene gland; ]l., oviduct; E. Yg., "Excavatio 

 vaginae; 7 ' Kl., cloaca; Pr. g., genital pore; Vd. E., end portion of vas 

 defereus; Vg., vagina; V. d., vas deferens ; Rec. s., receptaculum seminis; 

 Sblg., duct of receptaculum seminis; Sd., shell-gland; Sbcut., subcuticula; 

 Ho., testicles; Cut., cuticle. After Meyuer, 1895, PI. I, fig. 3. 



5. Ventral view of segment from one of Meyner's cotypes. No. 1483, U.S.N.M. 



6. Bertia conferta, from the Bonnet Monkey (Macacus sinicus). Transverse 



section. After Meyner, 1895, PI. II, fig. 9. For lettering see fig. 4. 

 Drawn by Haines. 



PLATE X. 

 Bertia americana; Bertia americana leporis. 



FIGS. 1-10. Bertia americana, from Erethizon. 



1. Specimen from the Yellow-Haired Porcupine (Erethizon epixanthus). 



Natural size. 



2. Specimen from the Canada Porcupine (Erethizon dorsatus). Natural size. 



After Curtice, unpublished. 



3-5. Three enlarged views of head. Specimen from E. epixanthtis. Zeiss, 

 4-a* 10. 



6. Enlarged view of head, after Curtice, unpublished. Specimen from 



E. dorsatus. 



7. Dorsal view of anterior portion of strobila from E. epixanthus. The fig- 



ure is combined from a specimen mounted whole, and from several 

 longitudinal and transverse sections. The head is retracted; dorsal 

 canal is between ventral canal and nerve ; female anlage appears in 

 second segment; testicles in third segment, and round receptaculum 

 seminis in fourth segment. The testicles become more numerous and 

 the female glands gradually shift position to the right or left of the 

 median line according to the position of genital pore. Zeiss, 4-a*. 



8. Diagrammatic transverse section of a very young segment ; the dorsal 



canals are connected with the transverse canal; the female anlage 

 appears in the median line. Host: E. epixanthus. 



9. Transverse section of segments of a specimen from E. epixanthus. Zeiss, 



4-16. 



10. Gravid segment. Host: E. epixanthus. Zeiss, 4-a* 10. 

 11-15. Bertia americana leporis, from Lepus sp. 



11. Strobila, natural size. No. 1171, U.S.N.M. 



12. Head. No. 1170a, U.S.N.M. Zeiss, 4-a* 10. 



13. Head. No. 1176a, U.S.N.M. Zeiss, 4-a* 10. 



14. Dorsal view of young segments showing nerves, dorsal and ventral 



canals, cirrus, cirrus-pouch, vas deferens, testicles, receptaculum semi- 

 nis, and very indistinct anlage of female glands. No. 1171, U.S.N.M. 

 Zeiss, 4-a* 10. 



15. Slightly older segments. No. 1170, U.S.N.M. Zeiss, 4-a* 10. 



N. B. All of these figures (except 2 and 6) were made from rather 

 poorly preserved material. 

 Drawn by Haines. 



