380 W. C. MSINTOSH ON BRITISH ANNELIDA. 
are situated at the posterior border, and the anterior toward the front, of the cephalic 
prominence, but not so far forward as in H. stbbaldii. The tentacle is short, not much, 
if any, enlarged below the filiform tip, and furnished with a few clavate papille. The 
antennee are short, enlarged at the base, and taper at the tip (after the manner of the 
ventral cirri), and with sparse but distinct clavate papille. The palpi are gently tapering 
from base to apex, and have minute papille under a high power (they are smooth or 
only wrinkled under a low power). The tentacular cirri taper from base to apex, have 
no enlargement below the latter, and, similarly to the antenne, are supplied with 
clavate papille. The cephalic appendages are rather short. The dorsal cirri resemble 
the Jatter; and their tips reach anteriorly to the extremity of the ventral bristles. The 
ventral cirri are enlarged at the base, and have a few clavate papille. 
There are fourteen pairs of scales, smooth under a lens, but showing sparsely dis- 
tributed clavate papille along the posterior border, and over the usual area, under a 
high power. ‘The first pair are small and round, the size increasing posteriorly till the 
twelfth, when a diminution again occurs in the thirteenth and fourteenth. Most are 
yather oveid than reniform. 
The dorsal bristles are divergent, stout, sharp-pointed, and extremely brittle. A 
lateral view of a large specimen is given in P]. LXIX, fig. 1. There is a slight bend at 
the tip, as well as a marked curve in the shaft. A front view of another is exhibited 
in Pl]. LXVIII. fig. 4. The ventral bristles have superiorly a short spinous region and 
a long bifid tip (Pl. LX VIII. fig. 5). The tips diminish as usual toward the ventral 
edge of the fascicle, a few of the lowest having no distinct secondary process at the 
termination. 
Contrasted with the young of Harmothoé imbricata, the head of this form is much 
more elongated antero-posteriorly; and the four eyes are visible from the dorsum, 
whereas in HH. imbricata the posterior pair only are generally seen. The tentacle, 
antenne, and other cephalic processes are different. The bristles are much larger in 
H, imbricata, so as to give a different outline; and their structure and the scales are 
essentially at variance. From the Parmenis ljungmani of Malmgren it differs in the 
number of the scales, their colour, the structure and size of the dorsal bristles. Its 
nearest ally seems to be H. sidbaldiit. The Polynoé vasculosa of M. Claparéde' likewise 
approaches it. 
Potynoii FLoccosa, Sav. This species seems to be in want of careful revision, since it 
is doubtful if M. de Quatrefages, unless he had Savigny’s specimen, would be able to 
decide with accuracy what the older author meaut. It is the Harmothoé sarniensis of 
Prof. E. Ray Lankester*, and abounds all round our coasts, from Shetland to the Channel 
Islands. It is distinguished from H. imbricata by the general colour of the dorsum, 
* Annél. Chétop. du Golfe de Naples, Supplément, p. 12, pl. i. f. 4. 
* Trans. Linn. Soc. vol. xxv. p. 374, tab. 51. f. 14, &e. 
