292 SUBANTARCnC ISLANDS OF NEW ZEALAND. [Oligochaeta. 



Natiodrilus jallax. 

 Fig. 16. Spermatheca. ( x 6.) 

 Fig. 17. Prostate of the same. ( x 6.) 



Plagiochacta plunketi. 



Fig. 18. Longitudinal section of vestigial gizzard, with neighbouring portion of oesophagus. (Camera, 



X 30.) 

 Fig. 19. Penial chaeta of segment 17, and normal locomotive chaeta of 20th segment. ( x 60.) 

 Fig. 20. Spermatheca ; figure compiled from sections. 



Fig. 21. Spermatheca. ( x 18.) 

 Fig. 22. Spermatheca. ( x 18.) 



Leptodrilus Icptomerus. 

 Leftodrilus mtujneticus. 

 Plutelltis aucldandicus. 



Fig. 23. Spermatheca. ( x 12.) 



Fig. 24. Prostate of left side in situ, and the arcuate muscles (m) of the 19th segment, a, h, c, d, the 

 four chaetal rows, indicated by their gaps in the longitudinal muscular layer of the body- 

 wall (the prostate duct perforates the wall in line with chaeta b) ; n, nerve-cord. 



Fig. 25. Plan of the course of the lumen of the prostate, compiled from a series of sections. ( x about 

 30.) Only a few of the bunches of glands are shown opening into the little diverticula of 

 the central lumen. 



Fig. 26. Portion of the foregoing, enlarged, a, main lumen of prostate ; b, diverticula ; c, bunch of 

 gland-cells. 



Diporochaeta heterochaeta. 



Fig. 27. Portion of the ventral surface of segment 7, showing the two much enlarged chaetae on each 



side of the middle line. (Camera, x 30.) 

 Fig. 28. Ventral chaeta of segment 6 (a) and of segment 14 (b) from a transverse section. (Camera, 



X 30.) 

 Fig. 29. Spermatheca. ( x 8.) 



Diporochaeta hehphila. 



Fig. 30. Transverse section, to show the peculiar arrangement of the pigment (a) on the coelomic epi- 

 thelium all round the body, (6) in the epidermis on the dorsal surface only. (Camera, 

 x 30.) 



Fig. 31. Portion of the preceding, enlarged. (Camera, x 185.) a, flaky pigment in somatic coelomic 

 epithelium ; b, longitudinal muscles ; c, circular muscles, with granular pigment between 

 the fibres ; d, epidermis, with very fine granules of pigment apparently inside the cells. 



Fig. 32. Portion of the somatic coelomic epithelium on dorsal wall, from a longitudinal section. (Camera, 

 X 185.) The pigment lies at the surface of vesicular cells, a, pigmented cells ; b, longi- 

 tudinal muscles ; c, nuclei of pigment-cells. 



Fig. 33. Spermatheca, as compiled from a series of longitudinal sections. 



Diporochaeta brachysoma. 



Fig. 34. Prostate, in situ, from a bisected specimen. D, dorsal wall, nearly in the median line ; 



V, ventral wall ; a, arcuate muscles. 

 Fig. 35. Spermatheca. ( x 30.) 



Diporochaeta perionychopsis. 

 Fig. 36. Prostate. ( x 6.) 

 Fig. 37. Horizontal section of prostate, showing the branching of the lumen. The gland-cells are not 



indicated. (Camera outline.) 

 Fig. 38. Transverse section of the prostate duct. (Camera outline.) The sperm-duct (a) lies in the 



muscular wall. The three lumina (b) do not unite till close to the external pore. 

 Fig. 39. Spermatheca. ( x 12.) 



