154 Prof. M‘Intosh’s Notes from the 
The anterior curved plate has nine teeth on the right, five or 
six on the left. A small isolated process with a tooth occurs 
externally. The oblique anterior edges of the mandibles 
have in some specimens irregular denticulations and a notch 
on each side internally with a dark band; in others the edges 
seem to be smooth. The shafts are slender and pointed. 
The 1st foot has dorsally an elongated tapering dorsal 
cirrus, springing rather beyond the middle of the short foot, 
and which has a group of slender spines projecting into its 
base. Beyond the tips of these spines a long, slender, 
tapering (branchial) process arises from the dorsal edge, and 
is shorter than the cirrus, which, like the setigerous region, 
is permeated by a network of fine blood-vessels. None of 
the latter were seen in the branchial process. The setige- 
rous region forms a blunt cone supported by four tapering 
spines, and with a long lanceolate papilla projecting from 
its posterior edge. The bristles are similar to those of 
Onuphis quadricuspis, but not identical, having hollow shafts 
(Pl. XIII. fig. 38) with a bend and wrinkles at the com- 
mencement of the terminal region, which has a hook at the 
end, followed closely by a secondary process, and then a 
single spike—two tapering wings which project beyond the 
tip guarding the whole. A subulate ventral cirrus arises 
near the base of the foot ventrally. 
In its progress backward the dorsal cirrus has a tendency 
to diminish, whilst the branchial filament has a tendency to 
increase. Thus at the 10th foot (Pl. XIII. fig. 39) the 
branchial process is now the longer, though the cirrus has 
the larger base, a condition due mainly to the shrinking of 
the dorsal cirrus, for some of the branchial. processes in front 
are really longer than that of the 10th foot. The setigerous 
region is now almost adnate, with a dimple in the centre, 
apparently the separation between the actual setigerous region 
aud the adnate ventral cirrus. The papilla from the poste- 
rior border of the tip is also much reduced. Simple tapering 
bristles with scarcely a trace of a wing only appear. A group 
of spines pass to the dorsal cirrus as in front and the setige- 
rous region has two strong spines. 
So far as the specimens showed, the branchial filament 
increased in size, being the most conspicuous process of the 
foot, and still retained pre-eminence to the posterior end of 
the longest fragment, the dorsal cirrus being much smaller. 
Both diminished im size posteriorly, but the proportions held. 
At the 20th foot the branchia is nearly twice as long as 
the cirrus, and its vascular trunks are conspicuous. ‘The 
foot forms a slightly rounded projection, a dimple separating 
