W. C. M‘INTOSH ON BRITISH ANNELIDA. 389 
represented in fig. 8 (the serrations in all our examples are apparently less numerous 
and wider apart than 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. 
POLYNO# SCOLOPENDRINA, Say. Occurs at various points, both east and west, from 
Shetland to the Channel Islands, and generally in the tubes of Terebella nebulosa. 
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 
clayate papille slightly dilated at the tip. The ventral cirrus has similar appendages. 
Malmgren’s figures of the bristles are imperfect. 
AcHOLOii ASTERICOLA, Delle Chiaje. This species appears to have been first clearly 
distinguished as British by Dr. Carrington (his Polynoé 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 papille. ‘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 (Pl. LXX. fig. 11). 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 (Pl. LXX. fig. 12). M. Claparéde’ gives a very fair account 
of the species, which he found in company with Stephania flexuosa on ‘“‘Astropecten 
aurantiacus” in the Bay of Naples. 
ACOETIDZ. 
The only representative of this family found in British waters is Panthalis erstedi, 
Kbg., which was dredged by Dr. Gwyn Jeffreys in 75 fathoms, thirty-five miles off the 
Skerries, Shetland. It is a large species, distinguished by the massive body, the 
1 Supplém. Annél. Chét. Nap. p. 18, pl. 2. fig. 1. 
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