EEPORT ON THE ANNELIDA. 
297 
at the bases of the feet. Extravasations of blood existed between the alimentary wall 
and the muscular sling surrounding it. 
Eunice trihranchiata (PI. XXIa. figs. 6, 7). 
Habitat . — Dredged at Station 186 (off Cape York, Australia), September 8, 
1874; lat. 10° 30' S., long. 142° 18' E. ; depth, 8 fathoms; surface temperature, 
77°‘2 ; sea-bottom, coral mud. 
A fragment of the posterior end, measuring about 48 mm. in length, with a breadth 
at its anterior part of 4 mm. The tail is not present. The body is somewhat flattened 
and comparatively soft. 
Each foot bears dorsally a long branchial process of three (rarely four) divisions, 
the first of which comes off inferiorly, and the main stem then divides into two long 
and nearly equal branches. So close to the base do all these processes spring that at 
first sight the common stem is overlooked. To those with four divisions, however, this 
remark is not applicable. The dorsal cirrus is short and tapering ; the ventral is also 
short and somewhat conical. 
Dorsally in each foot is a tuft of simple tapering bristles, the wings just being 
visible. The brush-shaped forms have upwards of twelve filaments, one of the lateral 
being longer. In the compound bristles (PL XXIa. fig. 6) the tip of the shaft is rather 
abruptly bent and dilated, so that the internal strise are oblique. The distal piece has 
a small terminal and a large main fang. 
Besides the foregoing, each foot has a powerful blackish spine, with a curved tip 
superiorly. Inferiorly the two dark brown hooks (PI. XXIa. fig. 7 ) have an erect 
terminal process and a strong main fang. 
The intestinal masses contained sandy mud with a few fragments of Algse, sponge- 
spicules, and Foraminifera. 
The great distention of the alimentary canal had stretched both dorsal and ventral 
longitudinal muscles. The nerve-area is wide, and the cords thin and flattened. The 
vertical muscles passing from the alimentary canal to the hypoderm bound the area. 
These muscles enclose a somewhat triangular space, narrow above and broad below, the 
lower boundary being formed by the nerve-cords. An indistinct neural canal is 
visible superiorly, but none of the preparations show an inferior one. Indeed, some 
doubt remains concerning the latter point. 
This form approaches Eunice equibranchiata from the coast of Brazil, but differs 
from it in the structure of the branchiae, the minute structure of both bristles and great 
hooks, the latter in the Brazilian form having the main fang lengthened. 
(ZOOL. CHALL. EXP. — PART XXXIV. — 1885.) 
LI 38 
