REPOKT ON THE ANNELIDA. 
41 
from below upward, and furnisbed with elongated spinous tips. The stronger upper 
series are much more boldly spinous than the lower, each, however, having the same 
armature, viz., a double row of spines from the point where the shaft begins to diminish 
nearly to the tip, which is bare (PL IVa. fig. 4). (2) The upper division shows in some 
only a single powerful brownish bristle (PL IVa. fig. 3) with a strong hook at the top 
of the shaft, and a series of about twenty-five spines beyond it ; while the tip for a 
considerable distance is quite smooth and gently hooked. This kind of bristle has much 
more numerous processes than the homologous forms in Lcetmonice Jilicornis from 
Shetland, yet the cirri of the latter are throughout of a more elongated character, even 
to the terminal pear-shaped processes. 
The third foot has all the foregoing nharacters more decidedly developed, and the 
number of strong bristles in the upper group of the ventral series is increased. As in the 
second foot the ventral cirrus has undergone a change, being now a short process with a 
filiform tip, thus diverging from the elongated dorsal with its pear-shaped extremity. 
The fourth foot, perhaps, presents a maximum amount of complexity in regard to its 
bristles. From below upward it shows— above the greatly diminished ventral cirrus — a 
dense series of the doubly serrated kind, the upper groups presenting a strong tooth at 
the commencement of the spinous row on each side, and since they are not opposite, an 
alternate character is impressed on the rows. From the papilla above spring one or 
two very powerful bristles, with a basal spur at the tip, and apparently only a single 
row of spines. Then from the upper papilla arises a still stronger bristle with the hooks 
and spines better developed. In the superior division of this foot there are no less than 
four groups of bristles : (1) An inferior dense series composed of bristles with compara- 
tively smooth slender shafts and simple tips. The shafts are finely striated longitudinally 
(by transmitted light), and the tips are shaiq), smooth, and finely tapered. (2) A vertical 
series of strong brown bristles (few in number), distinctly curved, with granular or 
minutely nodulated shafts and delicately tapered tips. (3) Immediately in front of 
the former is a group of simple bristles with long sharp tips like the inferior division 
of the dorsal series. (4) Superiorly is a set of bristles, more slender than the second 
group, but stronger than the third, and showing granulations, especially towards the tip. 
The eighth foot still presents the four groups superiorly, the more robust being in front 
and somewhat below the dorsal cirrus. Ventrally there are four or five very strong 
though very brittle bristles which show an increase in the gap between the spine and 
the more numerous spikes beyond. The seventh foot bears dorsally a series of very long- 
spines, and a scale but no dorsal cirrus, the eighth having neither of the former. The 
spines of the seventh are not barbed at the tip, but they are fully so in the ninth group. 
In an average specimen the following is the arrangement of the feet in regard to 
cirri and bristles : — the first presents a dorsal and ventral cirrus ; the third, a dorsa^. cirrus ; 
in the fifth the bristles have undergone great elongation, but are without traces of barbs ; 
(ZOOL. CHALL. EXP. — PART XXXIV. 1885.) LI 6 
