Gatty Marine Laboratory, St. Andrews. 151 
The mandibles have an uneven sloped edge anteriorly and 
tapering shafts. A black pin-shaped bar occurs at the 
mner edge of each anteriorly. In one example, a new maxilla 
was developing after the manner of a new bristle or hook. 
The point is short and strongly curved. The functional 
maxilla of that side was perfect. 
The next segment carries the first pair of feet, which are 
considerably shorter than in such types as Hyalinecia tubi- 
cola and O. conchylega, and pass transversely outward instead 
of sloping forward to the anterior border of the head as in the 
forms mentioned. The dorsal cirrus is well developed and 
subulate; the button-shaped tip is minute, whilst a long 
subulate papilla extends from the posterior edge. The 
ventral cirrus projects as a subulate process ventrally. 
The setigerous region forms a short cone, supported by a 
group of spines with slender tips. The bristles (Pl. XII. 
fig. 35) are pale and appear to be hollow (or with fluid 
internally), have a distinct bend, and an incurvation on 
the concave side at the tip, which is bifid with long tapering 
guards or wings. Such a condition indicates a tendency to 
form a jointed tip. A few simple tapering bristles are also 
present. 
The 2nd foot differs little from the Ist, though it and the 
ord have a more slender dorsal cirrus. The 4th foot has 
its ventral cirrus in the form of a pad. The four segments 
bearing the feet described form a region of the body 
characterized by broader and shorter segraents. The suc- 
ceeding segments are narrower and longer from side to side. 
The branchiz commence as a simple filament on the 
6th foot*. At the 10th foot there are two branchial 
filaments, and the setigerous region has now become a short 
cone. Dorsally is a tuft of simple tapering bristles with a 
slight wing, and inferiorly are two strong bifid hooks. 
The 20th foot (Pl. XIII. fig. 36) has four branchial 
divisions, a tuft of slightly brownish dorsal bristles with a 
narrow wing at the tapering tip, and three strong bifid hooks 
beneath. In shape these differ from those found in Onuphis 
conchylega and H. tubicola. The shafts are powerful and 
both processes at the tip are strong, the secondary, however, 
being the more conspicuous. They are also winged (Pl. XIII. 
fig. 37). The highest number of branchial filaments seems 
to be four. 
The 30th foot is less prominent and has two branchial 
processes. The dorsal bristles are considerably longer and 
* Sars does not mention the foot on which these begin, 
