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. marphys(2, only a 

 few small papillae occurring on the surface. 



The dorsal bristles are somewhat longer than in H. marphysos (PI. 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 PI. 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 ofi". 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 Evarne impar. 

 It sometimes lives in the tube of Polycimis. 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. marphysce 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 venti'al 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. lunulata 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. Claparede^ whose figures, however, are not 

 very characteristic. 



Evarne impab, Johnst. This species is generally distributed throughout the British 



' Descrizione e not. pi. 144. f. 5, 6, and vol. v. pp. 56, 57. 

 ' Annel. Chet. du Golfe de Naples, p. 63, pi. 2. f. 1. 



