432 MR. R. C. LEWIS ON 
Fig. 2. Coronal section through head and first 25 segments, passing through suckers 
in head region. 
3. Coronal section through middle of head between suckers showing origin of 
genital glands immediately behind head; first sezments commencing 
immediately behind head. Large receptaculum seminis. Excretory 
ducts running up into head. Cirrus-pouch in some segments. 
4. Transverse section of head across suckers. 
Puate II. 
Cittotenia lagorchestis. 
Vig. 5. Transverse section of very young proglottis showing vagina as 2 thick-walled 
duct below the cirrus-pouch. 
6. Transverse section of an older proglottis showing vagina running out to 
open into genital atrium. 
7. Coronal section of a number of ripe proglottides. 
Prats III. 
Cittotenia lagorchestis. 
Fig. 8. Transverse section showing transverse excretory canal connecting the larger 
ventral longitudinal canals. 
¢. Transverse section of proglottis, slightly older than in fig. 6, showing vagina 
which has lost its connection with the genital atrium and is becoming 
abortive. 
10. Coronal section showing ovarian tubules arranged in a circle and opening 
by narrow ducts into reservoir. 
PratE IV. 
Cittotenia tagorchestis. 
Fig. 11. Enlargement of fig. 7, showing ovarian tubules, development of uterus, vitel- 
line gland, shell-gland, testes, genital atrium, sphincter muscle, cirrus- 
pouch, cirrus, spongy tissue, receptaculum seminis, transverse and longi- 
tudinal excretory vessels, and longitudinal muscles. 
12. Coronal section of amaturer portion of strobila showing uteri nearly meeting 
in median field. Disappearance of genital glands except cirrus-pouch 
and receptaculum seminis. 
13. Coronal section of tail end showing reproductive organs to within twelve 
segments of posterior end. 
Puate V. 
[Cittotenia lagorchestis. 
Fig. 14. Coronal section same as fig. 12, showing protruded cirri. 
15. Coronal section of posterior end showing excretory pore. 
Cittotenia villosa. 
16. Strobila showing fimbriations and liver-fluke shape. 
Prats VI. 
Cittotenia lagorchestis. 
Fig. 17. Longitudinal section in region of cirrus-sac showing testes and receptaculum 
seminis. 
18. Transverse section of mature proglottis showing uteri nearly meeting in 
median field. 
Cittotenia villosa. 
19. Transverse section of head through suckers showing’ quadratic cross-section 
as contrasted with tig. 4. 
20. Coronal section of head passing through suckers. Absence of neck and 
absence of reproductive organs ; longitudinal excretory canals. Segmenta- 
tion immediately behind head. 
