104 SPOLTA ZEYLANICA. 



EXPLANATION OF PLATES 

 Illustrating Dr. von Liiistoio's Paper on Nematoda hi the Colombo Museum. 



Plate I. 



Fig. 1. — Ascaris rotiindicaudata. Dorsal lip. 

 Fig. 2. — A. ceylanica. Dorsal lip. 

 Fig. 3. — A. hracliyiira. Dorsal lip. 

 Fig. 4. — A. quadrata. Dorsal lip. 

 Fig. 5. — Spiroptera dentata. Head end from the side. 

 Fig. 6. — Same. Frontal view of head. 

 Fig. 7. — Same. Tail end of the male. 

 Fig. 8. — Spiroptera triangulum. Tail end of male. 

 Fig. 9. — Heterakis trilabium. Tail end of male ; cirri omitted. 

 Fig. 10. — H. anomala. Head. 

 Fig. 11. — Same. Tail end of male. 

 Fig. 12. — Strongylus pigmentatus. Bursa of male. 

 Fig. 13. — Same. Cirrus of male. 

 Fig. 14. — Kalicephalus willeyi. Frontal view of head. 

 Fig. 15. — Same. Side view of head. 

 Fig. 16. — Same. Dorsal view of head. 

 Fig. 17. — Same. Bursa of male. 



Fig. 18. — Same. Transverse section of body ; d, intestine ; 

 6-. lateral field ; g. lateral vessel or canal. 



Plate II. 



Fig. 19. — Oxyuris ptoculiun. Frontal view of head. 



Fig. 20. — Same. A cup-shaped expansion of the duct of the 

 cBSophageal glands. 



Fig. 21. — Same. Tail end of male. 



Fig. 22. — Oxyuris acanthura. Tail end of male. 



Fig. 23. — Ctenocephalus tiara. Frontal view of head ; d. dorsal 

 lip ; V. ventral lip ; a. external orifice of the cervical glands. 



Fig. 24. — Same. Ventral view of head ; v. erected ventral lip ; 

 k. cervical gland. 



Fig, 25. — Same. Tail end of male. 



Fig. 26. — Same. Transverse section through the neck region ; 

 0, oesophagus ; h. cervical gland. 



Fig. 27. — Same. Transverse section through a female ; d. dorsal 

 tract ; v. ventral tract ; s. lateral field ; d. intestine ; o. ovary. 



