REPOET ON THE ANNELIDA. 
35 
is coated with greyish mud, amongst which a Sabdlaria was found, so that there must 
have been soft parts amongst the rocks. The colour of the beautiful lateral hairs differs 
from that of the common species, being of a more delicate green, the whole indeed 
inclining to a mixed pale bluish appearance. These lateral hairs are also much longer. 
The segments are forty-two, the posterior region, which as usual in the group is distinctly 
narrowed, bearing a proportionally larger number. The dorsal felt is extremely tough and 
dense, more so than in Aphrodita actdeata. The head is a rounder and comparatively 
larger organ than in the latter, having in front a short blunt conical tentacle or papilla, 
immediately behind which (in a transverse line) are two eyes on each side, the anterior 
pair being wider apart than' the posterior. They are small but distinct black points, 
entirely sessile. 
The body is more depressed than in Aphrodita actdeata, and instead of the rows of 
stiff, sharp, dark brown spines which flank the sides in the latter, a series of light bronze- 
coloured spines project outwards amongst the hairs. The tips of these do not taper 
much, but end in somewhat broad points (PI. VIa. fig. 4), which are covered with 
minute chitinous spikes, so that the surface is rasp-like. In consequence of this structure 
the tips are generally coated with extraneous organisms of various kinds. The inner tufts 
of bristles, which curve round and backward amongst the felt of the dorsum, are broad 
at the base but taper to a slender tip, also marked by slight roughnesses or points. A 
translucent filiform prolongation of the tip is common (PI. YIa. fig. 5). 
The ventral bristles anteriorly are for the most part dart-shaped (PL VIa. fig. 7), but 
the tip is seldom entire. It is easy to pass from this form to the slightly hairy kinds as 
we proceed backward, and then to the form typical of the group (PI. VIa. fig. 6), the 
figure rej^resenting one of the smaller bristles from the inferior division of the ventral 
branch of the foot, these being somewhat less liable to injury than the strong upper ones. 
In the latter the tips are almost all broken, a mere trace of the hairy part remaining. 
Posteriorly the ends of the stout superior ventral bristles are rather more tapered. 
The dense tufts of fine iridescent bristles which spring from the middle of each foot 
are longer than in Aphrodita aculeata, and on the whole the basal regions of the shafts 
are more slender. They taper to an extremely fine tip. 
The dorsal cirri occur on alternate feet, and are long and finely tapered toward the 
tip, which is slightly clavate. The surface is smooth, while internally a very distinct 
muscular band occupies the middle. A peculiar network of fibres, apparently sub-hypo- 
dermic, is also present. The ventral cirri have the same position as in Aphrodita 
aculeata, but the tips are more finely tapered and more definitely bulbous. Though the 
cirri of the dorsum are alternate in Aphrodita, the alternate arrangement of the bristles 
present in Lcetmonice does not occur. 
Dr. Baird does not mention eyes (though they are present) in his examples, which 
were considerably larger than the foregoing. They came from Port Lincoln and Van 
