W. C. M'INTOSH ON BEITISH ANNELIDA. 389 



represented in fig. 8 (the serrations in all our examples are apparently less numerous 

 and wider apart tlian shown by Malmgren's artist) ; and, secondly, a few with charac- 

 teristically curved tip and secondary process beneath (fig. 9). The rows of spines or 

 serrations are not opposite, but alternate, as shown in fig. 10, which is a drawing of a 

 larger form than the latter. There is a slight enlargement of the shaft beneath the 

 spinous portion. 



PoLTNOE SCOLOPENDRINA, Sav. Occurs at various points, both east and west, from 

 Shetland to the Channel Islands, and generally in the tubes of Terehella nehulosa. 

 The finest specimens come from the Outer Hebrides. The dorsal branch of the foot 

 bears a small tuft of spinous bristles with curiously dilated and peculiarly wrinkled tips, 

 but often so covered with extraneous growths that their structure is difficult to deter- 

 mine. When the foot is pressed between glasses the tips of this series just reach the 

 bases of the ventral bristles. The latter consist superiorly of one or two stout, simple 

 bristles, much stronger than the succeeding, and with short spinous rows; the rest 

 have short serrated portions and boldly bifid tips. The presence of the first series 

 renders generic distinction necessary. At the posterior part of the body only one of 

 this kind occurs in each foot. The dorsal cirrus is almost subulate, with short 

 clavate papillse slightly dilated at the tip. The ventral cirrus has similar appendages. 

 Malmgren's figures of the bristles are imperfect. 



AcHOLOE ASTERICOLA, Delle Chiaje. This species appears to have been first clearly 

 distinguished as British by Dr. Carrington (his Polyno'e asterinw), who found it at 

 Southport on Astropecten irregularis; and I am indebted to him for my specimens. 

 Dr. E. Perceval Wright likewise procured it at Galway. It is easily discriminated by 

 its comparative length, and the large number and coloration of the scales. The dorsal 

 cirrus tapers from base to apex, and has a very few short papillae. The ventral cirrus 

 appears to be smooth. The bristles of the dorsal branch are minute, and a limited 

 portion in the specimens projects beyond the surface (PI. LXX. fig. II). The ventral 

 bristles are furnished with long shafts, a well-marked hook at the tip ; and although 

 there are spines on the concave surface, no larger processes occur at the base of the 

 rows as in allied forms (PI. LXX. fig. 12). M. Claparede' gives a very fair account 

 of the species, which he found in company with Stephania flexuosa on ^'Astropecten 

 aurantiacus" in the Bay of Naples. 



ACOETID^. 



The only representative of this family found in British waters is Panthalis mrstedi, 

 Kbg., which was dredged by Dr. Gwyn Jeffreys in 75 fathoms, thirty-five miles oft' the 

 Skerries, Shetland. It is a large species, distinguished by the massive body, the 

 ' Supplem. Annel. Chet. Nap. p. 18, pi. 2. fig. 1. 



3g2 



