398 
8. J. JOHNSTON. 
Typlilocoelum reticulare, figs. 5-7. 
Fig. 5. — Whole moniit. X 30. 
Fig. 6. — Excretory system, X 21. Compiled from a series of hori- 
zontal longitudinal sections, hy the camera lucida. F. c. Flame-cells. 
cap. Capillary vessel, net. Network of vessels. 
Fig. 7. — Nervous system, x 21. Compiled in the same manner and 
from the same series as used in fig. 6. jn c. Posterior commissure. 
Fig. 8. — Allopyge antigones. X 7. 
Fig. 9. — Diaschistorchis pandus. x 10. Unmounted specimen 
viewed hy direct light. 
Fig. 10. — D. pandus. x 20. G. c. Gland-cells surrounding the 
termination of the vagina. 
Fig. 11. — Pleorchis oligorchis. X 11. Viewed as a transparent 
object from the dorsal aspect. 
Fig. 12. — Steringotrema pulchrum. X 24. 
Fig. 12a. Egg with operculum. 
Fig. 12b. Egg from which the operculum has been removed. X 550. 
Fig. 13. — Petalodistonium polycladum. X 21. 
Fig. 14. — Petalodistonium cymatodes. X 11. Ea;. r. Excretory 
vessel. 
Micro-photographs. 
Rhabdiopoeus taylori, figs, 15-26. 
Fig. 15. — Part of a longitudinal sagittal section showing spines, thick 
ventral cuticle and the arrangement of the fibres in the muscular system. 
X 50. C.m. Circular muscle. D. v. m. Dorso-ventral muscle. L. m. Longi- 
tudinal muscle. N. c. Nerve-cord. 0. m. Oblique muscle. Sjh Spine. 
Fig. 16. — Part of a transverse section showing the arrangement of the 
muscle-fibres in the muscular system of the body and in the cirrus sac 
find vagina. The section also shows the very thick cuticle and the spines 
in transverse section. X 89. 
Fig. 17.— Transverse section showing the bifid nature of the ventral 
spines, x 54. 
Fig. 18. — Horizontal longitudinal section showing the relations of 
the nervous system, the alimentary canal and the excretory vessels. 
X 20. 
Fig. 19. — Transverse section showing the brain. X 51. 
Fig. 20. — Transverse section through the proboscis chamber and 
