P0LYCTL3ETA OF THE L.M.B.C. DISTRICT. 233 



ous tiny spines, (PL XIII, fig. 6). The inferior cirrus is 

 shortly and sparsely ciliated, not smooth as represented in 

 Malmgren's plate. The largest specimens were from 

 Southport — 33 mm. long — and in these the bristle bearing 

 segments sometimes reached 37. Malmgren gives 34 — 

 35 for the oldest. Notopodial seta, PL XIII, fig. 3. 



*Polynoe (Lagisca) extenuata, Grube. 

 Hab : Port Erin, Puffin Id., and Colwyn Bay; under stones. 



A single specimen was found at each of the above 

 localities. This is the first record of its occurrence in 

 British seas. Superficially it has considerable resem- 

 blance to Pohjnoe (Evarne) impar. The serration of the 

 dorsal bristles is however distinctly finer. (PL XIII, fig. 

 4). The bristles are nearly colourless and without the 

 brilliant golden hue so noticeable in those of the last-named 

 species. The tips of the ventral bristles are very charac- 

 teristic and reliable, especially among the strongly bifid 

 superior bristles of the bundle. Their angle of incision is 

 formed by nearly straight lines, wherein it differs from 

 what is seen in P. imbricata, impar and propinqua, where 

 the angle is made by curved lines. The upper median 

 ones, however, possess curved bifid apices, while the 

 inferior bristles show curved entire tips. These specimens 

 agree closely with the plates in Marenzeller's " Zur 

 Kenntniss cler Adriaiisclie Annelid en " except in one point 

 in the structure of the scale. In mine, the surface of the 

 scale is mapped out into a large number of separate areas, 

 each containing usually several papilla?, giving the appear- 

 ance of a line having been drawn around every three or 

 four papilla?, thus forming the latter into groups (see PL 

 XIII, fig. 8}. All the specimens show this very peculiar 

 marking, which is not to be found in Marenzeller's 

 figures. 



This species must be classed close to P. impar and P, 



