592 
Gestodes from Selachians 
VAN Beneden, P. J. (1850). Recherches siir la faune Uttorale de Belgiqu^ Les 
vers cestoldes, etc. Mim. Acad. toy. d. sc. de Belg., Brux. xxv. 
- (1858). Memoire sur les vers intestinaux. Paris. 
ZscHOKKB, P. (1888). Recherches sur la structure anatomique et histologique des 
cestcdes. Geneve. 
EXPLANATION OF PLATE XXIII. 
B. 
Cirrus pouch 
H. 
Testis. 
8D. 
Shell gland. 
G. 
Cirrus. 
K. 
Ovary. 
U. 
Uterus. 
D. 
Yolk gland. 
L. 
Vas deferens. 
V. 
Vagina. 
B. 
Egg-swaUower. 
N. 
Nerve. 
w. 
Excretory canal 
a. 
Yolk duct. 
0. 
Oviduct. 
Figures 1—6. 
Croasobothrium anguatum Linton. 
Fig. 1. Seolex. x30. 
Fig. 2. Middle segments, x 30. 
Fig. 3. Posterior segments, x 30. 
Fig. 4. Sagittal section through the posterior segment. 
Fig. 6. Diagram showing the interrelation of the genital organs. 
Figures 6—11. 
Orygmatobothrium velamentum n.8p. 
Fig. 6. Seolex and the anterior part of the body, x 20. 
Fig. 7. Middle segments, x 20. 
Fig. 8. Posterior segments, x 20. 
Fig. 9. Cross section through the level of ovary. 
Fig. 10. Diagram showing the interrelation of the female organs. 
Fig. 11. Horizontal section (semi-diagiammatic). 
Figures 12—13. 
AcarUhobothrium ijimai msp. 
Fig. 12. Hooks. x80. 
Fig. 13. Seolex. x 24. 
Figures 14—19. 
OaUiobothrium convolutum n.sp. 
Fig. 14. Posterior segments. x6. 
Fig. 16. Hooks. x66. 
Fig. 16. Cross section through the level of the ovary. 
Fig. 17. Interrelation of female organs. 
Fig. 18. Cirrus pouch, x 120. 
Fig. 19. Egg-swaUower. x300. 
Figures 20—21. 
OaUiobothrium rvodoaum msp. 
Fig. 20. Hooks, x 160. 
Fig. 21. Matured segment. 
