REPORT ON THE ANNELIDA. 
23 
ing toward the anal region. Pallas also correctly observed that the branchiae do not 
proportionately decrease posteriorly. 
The dorsal cirrns arises from the posterior part of the dorsal bristle-papilla, and has a 
basal and a distal division. The former is bluish in colour, the latter ferruginous and 
tapered towards the extremity, which extends as far outward as the tips of the bristles. 
Occasionally the dorsal cirrus of the second segment shows a small inner filament. The 
ventral cirrus is very short, but it possesses a similar structure. It is attached to the 
posterior border of the ventral curve of the foot. 
The dorsal bristles form a curved row, with the convexity directed forward, and 
consist of two kinds, viz., a stout series with grooved and serrated tips (PI. IIa. fig. 8), 
and a longer series with finely tapered, curved tips, the latter being minutely roughened 
on the convex side with small points (PI. IIa. fig. 9). The shafts of the longer kind are 
much more granular and opaque than in the stouter shorter series. The tips of the 
spinose bristles are peculiarly curved, and the surface from which the rough points spring 
would seem to be somewhat flattened. The points resemble the bases of a brush-like 
series of spikes (PI. Ia. fig. 16). The ventral bristles, again, are few in number and 
comparatively short, but powerfully developed (PI. IIa. fig. 10). The tip of each is 
strongly curved (hook -like), and marked by a series of fine striae in the opaque or whitish 
portion, these being continued downward on the posterior part of the bristle. 
The spines of both dorsal and ventral divisions of the foot are peculiarly expanded at 
the tip, and each differs from the other in the form of the dilatation. Thus the dorsal 
(PL IIa. fig. 11) has a more elongated tip; while the ventral (PL IIa. fig. 12) has a 
larger and shorter tip, and the entire organ is stronger. Besides the bristles and spines 
projecting externally, each bristle-sheath has various spines and bristles in course of 
development, and each from its earliest condition bears its characteristic features. The 
solid tips are the first parts to appear, and in the case of the ventral series the bristles 
are in pairs with a spine at intervals. 
The anus in most of the specimens is a great circular opening, embracing several 
segments at the posterior end of the body ; indeed the size of the aperture is a remarkable 
feature. Internally the mucous membrane forms a prominent mass, occasionally with a 
somewhat radiate arrangement of rugse. Pallas states that the anus is bilabiate, and in 
some conditions the description is very appropriate. Most of the examples in the present 
case may have lost the tip of the tail. The large size of the anus would indicate a 
peculiarity in the digestive function. 
In the intestinal canal fragments of sessile-eyed Crustacea were found in considerable 
abundance, generall}?" mixed with brownish-purple debris. The cirri of barnacles were 
also common, and occasionally a valve of the same animal, so that they would appear to 
feed on them ; they would readily be procured on the floating timber. 
The general structure of the proboscis conforms to that in Chloeia. The alimentary 
