164 Notes from the Gatty Marine Laboratory. 
the bristles, and thus appears to be somewhat shorter than 
in H. marphyse. A slight eminence below the cirrus gives 
origin to the pale dorsal bristles which radiate from it in a 
fan-like manner, but when compressed laterally show a 
shorter, stouter, upper, and a longer, more slender inferior 
series. The upper shorter forms are boldly curved and 
serrated on the edge. The more slender inferior bristles 
are less curved and the serrations on the hair-like tip 
are minute. A spine pierces the lower margin of the 
elevation from which the bristles emerge—in lateral view. 
‘These bristles thus closely resemble those of H. marphyse, 
differing only in the more minute serrations of the tips 
and their smaller size. The inferior division of the foot 
forms a cone with a pointed tip, up to the base of which the 
powerful spine goes. Its dorsal outline is sinuous, the 
ventral convex (in lateral view), the outline thus differing 
from that of H. marphyse, though the size in the respective 
cases has to be remembered. The upper two have elongated 
simple tips with only a slight swelling above the shaft and 
very minute serrations on the edge. Those in lateral view 
are above the spine. ‘Those below the spine have shorter 
tips, longer rows of spikes, and bifid tips, and the swelling 
above the shaft is more distinct. The short ventral cirrus 
has an enlarged base which rapidly tapers to a slender tip, 
aud its surface has a few clavate papille. Posteriorly all 
the parts of the foot are diminished, and the bristles are 
proportionally more slender and elongated. 
The scales have the colour mentioned by Mr. Arnold 
Watson, and a similar outline to those of H. marphyse, but 
they are thinner and more translucent ; moreover, in some 
no papillee can be observed. In other scales the papille, from 
ten to twenty in number, form a small compact group ou the 
thinnest margin of the scale and about its middle, whereas 
in H. marphyse these papille stretch in the adult female as a 
long band to the angle of the thin edge. The changes here 
indicated may be the result of growth, but there is a decided 
divergence. 
On the whole, this Polynoid closely approaches H. mar- 
physe, but the structure of the shorter head with its larger 
eyes, and the closer approach of the anterior to the posterior 
pair, the slight differences in the structure of the feet and 
the bristles all combine to cause hesitation. Intermediate 
examples, however, may yet enable future observers to unite 
them. It is an interesting fact, however, in connection with 
the ripe H. marphyse, that a marked change in the condition 
of the feet accompanies reproduction, though the eyes 
remain as minute as before, 
