388 PKOF, W. J. DAKIN ON THE 



4. Dakin. — The Onychopbora of West Australia. Proc. Zool. 



Soc. London, 1914. 



5. Denjdy. — On the Oviparous Species of Onychophora. 



Q. J. M. S. vol, xlv. p. 388. 



6. Dendy.— Zool. Anz. Bd. xxx. Nr. 6, 1906, pp. 175-177. 



7. Fletcher. — On the Specific Identity of the Australian 



Peripatus, etc. Proc. Linn. Soc. N. S.W. 1895, vol. x. 



8. Gaffrox. — Zoolog. Beitriige (Schneider). Breslau, 1883. 



9. Sedgwick. — Various papers on Per'qxUus. Reprinted in 



vol. iv. Studies fi'om the Morphological Laboratory of the 

 University of Cambridge. 1889. 



10. Sedgwick. — Article on Onychophora in Cambridge Natural 



History. 



11. Sheldon. — Anatomy of Peripatus capeusis, etc. Q. J. M. S. 



vol. xxviii. 1888. 



12. Baldwin Spencer. — Proc, Roy. Soc. Victoria, vol. xxi. (n. s.) 



pt. 2, 1909. 

 .13. WlLLEY. — Anatomy and Development of P. novce-hritannice. 

 Zoological Results. Part I. 1898. 



DESCRIPTION OP FIGURES. 

 Plates I.-V. 



Feripatoides occiclentalis. 



JFig. 1. Dissection, sliowing slime gland, alimentaiy canal, and salivaiy gland. 

 X 5i. 



2. Dissection, female, showing reproductive organs and nephridia. X SJ. 



3. Dissection, male, sliowing reproductive organs and crural glands. X o\. 



4. Photomicrograph. Transverse section, showing large seminal vesicle 



lying above alimentary canal and crural papilla retracted. 



5. Longitudinal section. Salivary gland. X 400. 



6. Inner face of body-wall in freshlj' dissected specimen, showing arrange- 



ment of main tracheae. The piece extends across the two vential 

 nerve-cords, and laterally up one side and beyond the mid-dorsal line. 

 The positions of three legs are shown (N). X 20. 



7. Alimentary canal-wall under low power, showing tracheae branching. 



X96. 



8. Tracheal branching. X 640. 



9. Tracheal tube, showing spiral thickening. X 800. 



10. Section through crural gland. X 160. 



11. Nephridium in longitudinal section, showing cilia. X 240. 



12. Photomicrograph of ciliated part of nephridium. 



13. Opening of vas deferens into vesicula seminalis, section to show structure 



of wall. X 200. 



14. Photomicrograph of section through vesicula seminalis, showing sper- 



matozoa and spermatogenesis. 



15. Transverse section. First part of vas deferens. X 200. 



16. Median part of vas deferens, with mass of spermatozoa. X 200. 



17. Terminal thick-walled part of vas deferens. X 200. 



18. Longitudinal section. Ductus ejaculatorius. X 200. 



19. Diagrammatic transverse section in plane of last pair of legs. X 24. 



■2,0. Diagrammatic transverse section in plane where vas deferens crosses below 

 nerve-cords posteriorly. X 24. 



21. T. S. Part of wall of anal gland of male. X 240. 



22. Diagram showing connections of receptacula seminis with oviducts, and 



ovaries. X 200. 



23. T. S. Infundibular region of oviduct. X 200. 



24. L. S. Wall of ovary and oviduct. X 240. 



25. T. S. Duct of receptaculum seminis. X 280. 



