386 W. C. M‘INTOSH ON BRITISH ANNELIDA. 
the termination) toward the centre of the scale, so as to indicate a V. In the forms 
from St. Andrews the pigment assumes the shape of the shell of Pandora, with a spot 
corresponding to the hinge anteriorly. They are as smooth as in H. marphysw, only a 
few small papille occurring on the surface. 
The dorsal bristles are somewhat longer than in H. marphysee (Pl. LXIX. fig. 16—in 
profile, and in fig. 17 antero-posteriorly, so as to show the usual alternate disposition 
of the rows of spikes, the specimens in both cases representing the longer forms next 
the ventral). One of the shorter bristles next the body is shown in Pl. LXIX. fig. 18. 
The ventral branch has superiorly a long series, having at the tip a secondary process 
separated only by a narrow fissure (Pl. LXIX. fig. 19). The fissure becomes more 
evident as the distal part decreases in length, but it again is less distinct ventrally, 
some at the extreme verge having a very short secondary process. A bristle from the 
middle of the ventral group is drawn in Pl. LXIX. fig. 20. 
The Zetlandic examples are somewhat elongated, and have longer feet, and longer 
and more delicate pale bristles; moreover the dorsal and ventral cirri are rather 
longer than in the southern forms. The persistent attachment of the scales is not a 
feature characteristic of these examples; for they readily fall off. They are in contrast 
in regard to the former characters with examples from the Channel Islands. As 
mentioned by Dr. Carrington, the majority show inferiorly a series of brown spots, 
which commence as four rows rather behind the middle. In some the sets are united 
so as to form two rows of bars at the junction of each segment; this junction some- 
times occurs posteriorly, even when there are four rows in front. It is a very active 
species amongst the Laminarian roots, and displays as much irritability as Hvarne impar. 
It sometimes lives in the tube of Polycirrus. The colours are for the most part 
retained after immersion in spirit; but the animal often breaks into pieces. It is 
brightly phosphorescent, glowing, when irritated, at the bases of the feet for a con- 
siderable time, and giving off flashes when immersed in spirit. 
It will be observed that the species approaches H. marphyse very closely, though 
the cirri of the latter are shorter and smoother, the bristles of the dorsal branch much 
shorter and less conspicuous, and those of the ventral shorter and more slender; more- 
over those of the superior ventral series have no bifurcation at the tip, the closest 
approach to the latter condition being in a variety of H. /unulata from St. Peter Port, 
Guernsey, which had an indistinctly bifid tip in one or two of its superior bristles. 
Such is unusual. I have united it with Delle Chiaje’s form’, especially on carefully 
considering the further descriptions of M. Claparéde’, whose figures, however, are not 
very characteristic. 
EyarNE mpar, Johnst. This species is generally distributed throughout the British 
‘ Deserizione e not. pl. 144. f. 5, 6, and vol. v. pp. 56, 57. 
* Annél. Chet. du Golfe de Naples, p. 63, pl. 2. f. 1. 
