118 AUSTRALASIAN ANTARCTIC EXPEDITION. 



Fig. 16. A parapod from an elytriferous segment anterior face ( x 15). 



17. One of the ventral clisetge ( X 90). 



18. A ventral chaeta from about the middle of the Imndle (x 90). 



19. The apex of a ventral tha'ta ( X 260). The pectinated frills are very delicate 

 and have an irregnlar course. 



20. The apex of a dorsal chsta ( x 250). 



Plate 6. 

 Harmothoe sfinosa (fig. 21). 

 Fig. 21. Dorsal view of a portion of a specimen, showing a " chess-board " pattern. 

 The parallel lines represent olive; the groups of dots, brown; where these are 

 closer together, a dark brown. (Fnlarged.) 



Harniofhoe tuherosa (figs. 22-29). 

 Fig. 22. Tip of a dorsal chfeta ( X 360), showing the characteristic " bearded " nature 

 of the upper frills, as seen in an unworn chjeta. The hairs really lie more 

 closely alongside the axis, but are here represented as outspread so as better 

 to show their relations. The hairs from the lower bundles in the figure have 

 Ijeen omitted from the near surface. The apparent " spines " are the edges 

 of the frills composed of the bases of several hairs superposed. 



23. Side view of the apex of a dorsal chseta from which the " hairs " have been 

 worn away ( X 360). The aspect as seen in Canada balsam mounts is likely 

 to be misleading, as owing to the transparency of the frills in front of the 

 axis, the structure is scarcely visible ; but in glycerine mounts it is more 

 readily interpreted; the apparent spines along the edge are then seen to be 

 the frills bending round the bristle, and are tlius a measure of the height and 

 thickness of these frills. 



24. Portion of the shaft of the same dorsal chseta, immediately below the apex 

 shown in fig. 23 ( X 360). This shows the angular character of the shaft 

 and the difference in the nature of the frills on face and side. The 

 uppermost frills are confined to the front face, the lateral frills commence 

 some distance from the apex. 



25. A ventral chseta from about the middle of the bundle ( x 35). 



26. A ventral chseta from upper part of the bundle, the frilled region from the 

 side, showing the spines in the upper frills ( X 360). 



27. The same from the front face ( X 360), showing two rows of spines one on each 

 side. 



28. Three posterior elytra of an individual with abnormally developed conical 

 tubercles ( x 6). 



29. The last elytroii of the same (X 10). 



