118 
AUSTRALASIAN ANTARCTIC EXPEDITION. 
Fig. 16. A parapod from an elytriferous segment anterior face ( x 15). 
17. One of the ventral chsetse ( x 90). 
18. A ventral ehseta from about the middle of the bundle ( x 90). 
19. The apex of a ventral ehseta ( x 260). The pectinated frills are very delicate 
and have an irregular course. 
20. The apex of a dorsal ehseta ( x 250). 
Plate 6. 
Harmothoe spinosa (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. (Enlarged.) 
Harmothoe tuberosa (figs. 22-29). 
Fig. 22. Tip of a dorsal cliseta ( X 360), showing the characteristic “ bearded ” nature 
of the upper frills, as seen in an unworn ehseta. 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 
been 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 clueta 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 thus a measure of the height and 
thickness of these frills. 
24. Portion of the shaft of the same dorsal ehseta, 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 ehseta from about the middle of the bundle ( x 35). 
26. A ventral ehseta 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 elytron of the same (X 10). 
