Gatty Marine Laboratory, St. Andrews. 163 
The proboscis has superiorly a pair of short and strongly 
curved maxillz (woodcut, fig. 9, a), which have the inner edge 
of the base posteriorly serrated, four or five points being 
present. ‘They are continuous posteriorly with a short broad 
plate of the same blackish-brown colour, and marked off by a 
slight indentation, which again articulates behind with two 
triangular smaller pieces, continuous, after a constriction, 
posteriorly with two greatly elongated slender bars, slightly 
tapered posteriorly. ‘The great dental plates are bar-like 
from above and are shorter than the curve of the maxille, 
though a process goes forward to the anterior plates. They 
have six recurved teeth, the anterior being longest. 
The small antero-lateral plates are three in number, each 
with a prominent tooth, the larger proximal one having a 
shoulder below the tip. 
The mandibles (woodcut, fig. 9, 0) are triangular, blackish, 
broad horny plates which lie considerably in front of the 
anterior plates and ventralwards. The wide anterior end is 
rounded and they do not always touch each other. 
The armature of the proboscis thus in many respects agrees 
with that in Drilonerets, which in all the examples seen 
possessed mandibles. The maxillz are brittle, especially at 
the wide base. 
The Ist foot has a small setigerous lobe in front and a 
conical lobe posteriorly. A pale stout spine pierces the upper 
part of the former. The bristles are broken. 
At the 10th foot the setigerous region is better developed 
and bears a series of stout winged bristles with a marked 
curvature beyond the shaft and a tapering tip (Pl. XIII. 
fig. 45). A single powerful spine or hook-like spine projects 
inferiorly, the tip being simple. The tips of the winged 
bristles project inferiorly. The posterior lobe is now some- 
what lanceolate in outline, its inferior border being convex. 
The shape of the foot is little altered at the 30th, and the 
tips of the inferior bristles are as in front, viz., just projecting 
in profile beyond the posterior lobe. The tip of the great 
simple spine is conspicuous inferiorly. 
At the 50th foot the posterior lobe is somewhat diminished 
(Pl. XIII. fig. 46), so that the tip of the great spine and the 
bristles are more prominent. The wings of the bristles are 
also narrower and the tips proportionally longer. 
Posteriorly, whilst the tips of the bristles are more slender, 
the great spine has rather increased in size. 
It is a very tough species, the cuticle resisting even con- 
siderable force, so that the bristles are apt to be injured in 
removing a foot. 
ike 
