.To2 Prof. M'Intosli's Notes from the 



vaiious cracks and crevices of the rocks in the same region. 

 The head (prostomium) is conical, and on each side, a short 

 distance from the tip, an oblique depression slopes outward 

 and baci<ward, and from the point at which these converging 

 grooves meet a ridge runs forward to the tip of the snout. 

 A^entrally a deep groove leads backward to the mouth, which 

 is bounded posteriorly by a thick transverse lip. In some 

 specimens from Lochmaddy a little pigment occurs on the 

 snout at the posterior and outer angle of the triangular 

 anterior region, thus simulating eyes — indeed, the pigment 

 is occasionally symmetrically arranged. In others from 

 Guernsey and Herm a distinct band of ocular points passes 

 from one side of the base of the snout to the other just in 

 front of the constriction indicating the region. A variety 

 with a blackish snout is met Avith at Herm, and Dr. Sowerby 

 forwarded some in a similar condition from the estuary of 

 the Orwell near Ipswich. 



The body is from 6 to 9 inches in length, rounded on the 

 dorsum, flattened ventrally, tapered anteriorly and more 

 distinctly but gradually diminished posteriorly, where it ends 

 in a pointed tail, the slit-like anus being dorsal^ whilst in the 

 mid-ventral line in some specimens is a small process like a 

 rudimentary cirrus. Others show in lateral view a process 

 above and a little in front of that just mentioned, and some 

 present only a large terminal anus with a rim and no process. 

 Such variations probably indicate injuries and reproduction. 

 The number of segments ranges to 300 and upward in a large 

 example. Vertical lines of dark pigment occur in the sulci 

 at the segment-junctions — from the fourth segment back- 

 ward for some distance. 



On an elevated ridge which lies dorsally between the fifth 

 and sixth bristled segments is a dense mass of tentacles on 

 each side. The ridge is somewhat crescentic in front, 

 straight behind, and the tentacles in the cluster number at 

 least twenty. Each segment behind the foregoing has on 

 each side its branchia situated behind and rather above the 

 level of the upper bristlc-tuft, and this throughout the whole 

 anterior region, to the number of about one hundred in 

 large examples. The branchije are more scattered in the 

 middle and posterior regions, and cease altogether about the 

 thirty- fifth or fortieth segment from the tip of the tail. 

 After the seventh or eighth the bristled segments for a con- 

 siderable distance are narrow, then become slightly wider, 

 and again toward the tip of the tail are narrow. The 

 remarkable spiral coils of the branchice constitute a feature 

 of the species^ and contact with sea-water is apparently less 



il 



