Explanation of Plate X. 



{Thahnessa, StJi.enolejAs, Stiienélais). 



Fig. 1. Anterior elytron of Thalenessa oculata Mcintosh. 9/1. 



rig. 2. Portion of tlie thickest region of a dorsal bristle from the 



parapodimn of same. 500/1. 

 Fig. 3. Dorsal view of the anteiior portion of Stlienole/pls Jajjonica 



(Mcintosh). 10/1. 

 Fig. 4. lîiglit anterior parapodimn of same. 22/1. 

 Fig. 5. Portion of dorsal bristle of same. 500/1. 

 Fig. 6. Superior ventral bristle of same. 500/1. 

 Fig. 7. Inferior „ „ „ „ 



Fig, 8. Ventral bristle of the anterior third of the body of StJienoIejns 



areolata (Mcintosh). 390/1. 

 Fig. 9. Dorsal view of the anterior portion of StJienelais hoa (Johnston). 



10/1. 

 Fig. 10. liiglit elytron of same. 16/1. 



Fig. 11. Papillae on the external margin of the same elytron. 140/1. 

 Fig. 12. Plight xDara podium of 33rd segment of the same annelid. 



22/1. 

 Fig. 13. Portion of a bristle from dorsal ramus of same. 390/1. 

 Fig. 14. Superior ventral bristle of same. 390/1. 

 Fig. 15. Inferior 

 Fig. 16. Middle 



