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. Berlia minronata, from the Black Howler (Jloiiaita carai/a). 



4. Trauverse seition of segment at genital pore: II. X., lateral nerve trunk; 



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

 sal canal; t7<., uterus; ^i. iS., middle layer; ^. 5., cortical layer; M.ir, 

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

 Od., ovary; I)s., vitellogene gland; EL, oviduct; E. Vg., "Excavatio 

 A-aginae;" KL, cloaca; Pr. g., genital j)ore; Vd. E., end portion of vas 

 defereus; Vg., vagina; F. f7., vas deferens ; i?ec. s., receptaculum seminis; 

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

 Ho., testicles; Ch<., cuticle. After Meyner, 1895, PI. I, fig. 3. 



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



6. Bert'ta con/erta, from the Bonnet Monkey {Alacacufi siniciis). Transverse 



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

 Drawn by Haines. 



Plate X. 



Bertia americana ; Berlia amcricana leporia. 



Figs. 1-10. Berlia americana, from Erethizon. 



1. Specimen from the Yellow-Haired Porcupine {Erethizon epixauthus). 



Natural size. 



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



After Curtice, unpublished. 

 3-5. Three enlarged views of head. Specimen from IC. ejyixanthns. Zeiss, 

 4-a* 10. 



6. Enlarged view of head, after Curtice, unpublished. Specimen i'loui 



E. dorsatiia. 



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



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

 longitudinal and transverse sections. The head is retracted; dorsal 

 canal is between ventral canal and nerve; female aulage 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 

 nu'diuii line according to the position of genital ])ore. Zeiss, 4-a*. 



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



canals are connected with the transverse canal; the female aulage 

 appears in the mediau line. Host: E. epixanthii.i. 



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



4-16. 



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

 11-15. Bertia americana hporix, from Lepns 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 

 l)oorly preserved material. 

 Drawn by Ilaiues. 



