Fig. I 



KXPIvANATION OF PLATE XVIII, 



Oxysoma macintoshii , sp. nov. 

 9 . X 75. 



2. — 9 outline of tail. X 75 (21/3). 



3. — Head of 9 in profile. X 750 (2/ 1/2). 



4.-0'. X 75 (10/2/). 



5.— Head of cf X 750 (12/2/). 



6.^ — Tail of & showing postanal papillae, papillae numbered 

 from behind forward. X 310 (10/2/). 



7. — Anogenital aperture of & showing bursa, peri- and 

 preanal papillae. X 750. (10/2/). The papillae are 

 numbered from behind forward in continuity with the 

 postanal series. 



8. — Posterior end of body and anterior end of tail of cf , 

 showing bursa and left spicule. X 750. (i/i/). 



g. — Head of right spicule. X 750. (lo/i/). 



10. — cf . Transverse section at a level shortly behind oeso- 

 phageal bulb. X 325. 



II, — cf . Transverse section at a level shortly in front of 

 the anus. Showing vas deferens and spicules (the 

 spicules at this level are incomplete cylinders). 

 .X 325- 



12. — cf . Transverse section through spicule at a more 

 posterior level than fig. 11. X 1500. 



