28 Prof. M‘Intosh’s Notes from the 
grasped by the cuticle, again dilates toward the main fang, 
a distinct bulge occurring below the origin of the gular 
bristles, where it is again narrowed below the main fang— 
which is curved at less than a right angle to the neck, and 
has four teeth above it. The neck and shaft are boldly 
striated. In the larger specimen the main fang leaves the 
neck nearly at a right angle, and above it are four prominent 
teeth. The gular bristle appears to be single, and sometimes 
curves beyond the main fang and over it. 
This species was first obtained by De Quatrefages, whose 
description is fairly complete. 
Two examples of Heteroclymene robusta, Arwidsson, come 
from Plymouth, and I have to thank Dr. Allen for the 
opportunity of examining them. Besides the lateral notches 
in the cephalic border, the rim behind has crenations, the 
median deepest posteriorly. The segments in the middle of 
the body can be much elongated, one being about an inch 
and three-quarters ; the bristles and rows of hooks project 
outward on enlargements at the segment-junctions. The 
anal dise is an exquisite structure, as finely radiate as the 
operculum of Serpula vermicularis, only the anus is in the 
centre of a cone, over which the radii pass downward and 
then upward to the minutely crenate edge. The mid-ventral 
cirrus is somewhat flattened, as well as longest, and there 
are three or four shorter cirri on each side, somewhat 
irregularly arranged, a portion of the dorsal edge being bare. 
The tube is as thick as that of Lanice conchilega, but 
firmer, retaining its cylindrical form until somewhat severe 
pressure is applied. It is composed of shell-fragments, 
minute shells, spines of Echinoderms, smoothly filled in with 
fine grains of sand and secretion. 
In Micromaldane ornithocheta, Mesnil, from Clew Bay 
(Southern), a minute form, measuring 4 mm. long, the 
cephalic region, when viewed from above, is somewhat 
clavate and symmetrically rounded (elliptical). In lateral 
view it is irregularly clavate, the dorsal outline being 
smoothly curved and ending ventrally in the projecting 
snout, which slopes backward and slightly upward to the 
mouth. 
The body is comparatively short, consisting of nineteen 
segments, seventeen of which are bristled. It is enlarged 
anteriorly, is cylindrical in the middle, and tapers posteriorly 
