582 ON SOME SOUTH PACIFIC NEMERTINES COLLECTED BY DR WILLEY. 



Fig. 7. C. orientalis. Section in the neighbourhood of the excretory pore, x 45. 

 Fig. 8. C. orientalis. Section through posterior region of body, x 60. 



Fig. 9. C. orientalis. 9 a shews the communication of the glandular portion of the ex- 

 cretory system with the duct. 9 6 is taken a few sections posteriorly to 9 a. 



b.io. wall of blood vessel. 



exc.d. excretory duct. 



exc.gl. glandular part of excretory system. 



PLATE LVIII. 



Fig. 10. C. orientalis. Section through unextruded proboscis, x 110. 



Fig. 11. C. orientalis. Longitudinal section through anterior end. Reconstructed from 

 several adjacent sections, x 60. 



Fig. 12. Drepanophm-us tvilleyanus. Sketch shewing anterior end of animal. Slightly 

 modified from a sketch made during life by Dr Willey. The only colour is chocolate brown. 

 X about 12. 



Fig. 13. Z>. willeyanus. Section through anterior end shewing the position of the eyes, x 60. 



Fig. 14. D. icilleyanus. Section through brain and head furrows, x 45. 



Fig. 15. D. ivilleyanus. Longitudinal vertical section through the body near the lateral 

 edge. Cf. Fig. 18 a... a. 



Fir,. 16. D. mlleyanus. Section taken in same plane as last but rather nearer the middle 

 line. Cf. Fig. 18 /3...y8. 



Fig. 17. D. willeyanus. Section shewing supra-anal commissure, x 110. 



PLATE LIX. 



Fig. 18. Z>. iviUeyanus. Section through middle of body, x 45. * marks opening of 

 rhynchocoelom diverticulum. 



Fig. 19. £>. iviUeyanus. Reconstruction shewing relations and extent of cerebral organ 

 and excretory system. x 40. * level where rhynchocoelomic diverticula commence. t level 

 where gut pouches start. 



Fig. 20. Z>. willeyanus. Section shewing shape and opening of an ovary, x 45. 



Fig. 21. Drepanophorus lifuensis. Section through precerebral region just behind common 

 opening representing proboscis pore and mouth, x 60. 



Fig. 22. D. lijuensis. Section through brain shewing the extremely large ventral com- 

 missure. X 60. 



Fig. 23. D. lifuensis. Section through cerebral region just anterior to where the lateral 

 cords leave the brain, x 60. 



Fig. 24. D. liftiensis. Section through region of cerebral organ, x 60. 

 Fig. 25. D. lifuensis. Section through level of excretory pore shewing the dilated "bladder." 

 X 45. 



