28 AUSTRALASIAN ANTARCTIC EXPEDITION. 



Passing backwards from the prostomium are two conspicuous white broad ridges, 

 the " epaulettes " or " ailerons," which cross over the peristomium and two following 

 segments" just'above the bases of the dorsal cirri and end at the hinder margin of the third 

 segment. Each of these structures is grooved along its upper surface, and its inner 

 margin is thickened, rounded, and opaque white ; they show well against the pigmented 

 surface of the dorsal surface. Though so conspicuous in the worm viewed by reflected 

 light, they are scarcely visible in a stained specimen mounted in Canada balsam. 



The peristomial dorsal cirri are about as long as the prostomial tentacles. The 

 ventral cirri of this segment are short. On the next two segments the dorsal cirri are 

 longer still, though their exact length is difficult to estimate as they are coiled. 



The dorsal cirri are cylindrical, smooth, and though presenting irregular con- 

 strictions here and there, are not truly moniliform; each is marked by a streak of 

 brown pigment along its external and internal faces. 



On the ventral surface there is, on each side, a series of segmentally arranged 

 great oval glandular pads such as Mclntosh describes for his Autolytus macleamnus. 

 I suggest that these glands are responsible for the membranous tube in which the worm 

 lives. 



The anterior dorsal cirri are as long as the width of the body, but decreases in 

 length posteriorly, so that in the mid-body, their length is about half this width, and 

 they become still shorter further back. 



The form of the parapod (fig. 7), and the arrangement of the chaetee are as Gravier 

 has described, though the ventral glandular pad is more definitely constricted off from 

 the body on the ventral surface than his figure indicates. The parapod is supported by 

 a couple of acicula lying close together side by side ; and carries, besides the bundle of 

 compound chsetse, one or two capilliforms ; it is, however, only exceptionally that one 

 can detect them owing to their fragility. 



The cup of the " gomphotrich " or compound chaeta (fig. 8), is characteristically 

 striated on one side, the appendix is, as usual, short with two unequal teeth, of which the 

 distal is slenderer than the other ; the latter presents slight differences according to its 

 position in the bundle ; in the lower chsetse it is sharply pointed as is the distal tooth ; 

 whereas in the upper ones it is usually bluntly rounded as if subject to wear. The form 

 of the appendix does not quite agree with the figure given by Gravier (p. 8, fig. 1), as I 

 find that there are no serrations below the teeth. It seems also to be somewhat broader 

 in proportion to the length than is shown by that figure. 



The pharynx, which Gravier was unable to study, extends back to the end of the 

 7th segment, where it bends forwards on itself, then turns back to enter the " stomach " 

 (or proventriculus), which occupies apparently segments 10-14 as seen in a specimen 

 that I dissected; but in a mounted specimen of smaller size, this stomach occupies 

 segments 7-10. Whether this difference is due to age or to a disarrangement during 

 dissection I cannot say. 



