principally marine, found on the South Coast of Devonshire. 21 
and spread, giving the animal a beautiful appearance: the upper 
lip is bilobate, behind which are five short tentacula, the middle 
one standing in the suture of the lip: between the two outer ten- 
tacula on each side is a small black eye: the first joint behind ~ 
the head is broader than the rest, and destitute of peduncles: | 
the posterior extremity is furnished with two small terminal cirri: | 
the mouth is large and placed beneath, concealing most formi- 
dable jaws, or complicated fangs, which were protruded occa- 
sionally as the animal became sickly, and very frequently in the 
agonies of death when a few drops of spirits were added to the 
sea water: this apparatus consists of three pairs of hooked fangs 
of a dark colour, one pair smooth, the others toothed, besides a 
pair of broad plates on the lower part of the mouth, the struc- 
ture of which will be better understood by the accompanying 
figure. Tas. III. Fig. 3. 3 
This is the largest species of Nereis yet discovered to inhabit the 
British shores, extending sometimes to fourteen or fifteen inches in 
length, and large in proportion. It inhabits rocky situations, and 
is found lurking under the broken fragments; but is rare. 
While the animal was in a glass of sea water, the circulation 
of the colouring secretion through the ramifications of the cirri 
was a curious object, and appeared to be effected at the will of 
the animal; but when it became sickly, the circulation was 
slower, rising up through the branches of the cirri gradually as 
in capillary tubes, and as soon as it expired all the colour from 
those parts vanished. 
NEREIS MACULOSA. 
Tas. III. Fig. 4. : | 
Body linear, with about thirty pairs of fasciculate u 
complicated with a slender pencil of bairs above the broad 
fascicles, 
