410 
Tapeworms of Birds 
DESCRIPTION OF PLATES XIX—XXI. 
REFERENCE LETTERS. 
c. cirrus; c.c. circular excretory commissure; c.p. cirrus pouch; ey. cysticercoids; 
d.v.c., d.'v.'c.' dorso-ventral excretory commissures; g.c. genital cloaca; i. lumen of 
intestine of brandling; l., 1.' longitudinal excretory vessel; m. membrane of cysticercofd; 
o. onchosphere; ov. ovary; r.s. receptaeuluni seminis; s.s.' acetabular excretory branches: 
t. testes; ut. uterus; v. vagina; v.g. vitelline gland; v.s. vesicula seminalis. 
PLATE XIX. 
Figs. 1-5. Davainea dubius n.sp. 
Fig. 1. Strobila. 
Fig. 2. Fourth proglottis. 
Fig. 3. Self-fertilisation. 
Fig. 4. Posterior proglottis. 
Fig. 5. Hooks (a) from sucker, (b) from rostellum. 
Figs. 6—9. Amoebotaenia sphenoides v. Lins. 
Fig. 6. Mature onchosphere. 
Figs. 7-9. Young cysticercoids. 
PLATE XX. 
Figs. 10-13. Hymenolepis interruptus Clerc. 
Fig. 10. Proglottis with genital organs. 
Fig. 11. Proglottis with uterus. 
Fig. 12. Reconstruction of excretory system. 
Fig. 13. Rostellar hooks, (a) after Clerc, enlarged by photography. The small size of 
the original figure would account for the slight discrepancy in measurements. 
(6) from the sparrow. 
Figs. 14-19. Amoebotaenia sphenoides v. Lins 
Figs. 14-15. Older onchospheres. 
Fig. 16. Young cysticercoid. 
Fig. 17. Section of Fig. 16. 
Fig. 18. Infected brandling seen in optical section. 
Fig. 19. Transverse section of infected brandling. 
PLATE XXI. 
Figs. 20-22. Fowl heavily infected with tapeworms and showing emaciation. See p. 391. 
Figs. 23-25. Sections of duodenum of the fowl with scolices in situ showing their 
relation to the intestinal villi. 
Fig. 23. Scolex of Davainea dubius. 
Fig. 24. ,, D. cesticillus. 
Fig. 25. „ Amoebotaenia sphenoides. 
