POLVCH/ETA OF THE L.M.B.C. BISTllICT. 137 



prop'mqna, between which it is intermediate in many 

 respects. 



Pohjnoi"' (Lagisca) propinqua, (Mahngren). 

 Hab : (). 8, 9, 12, 18, S, P, M, and Mp. Abmidant from 

 mid-tide to 57 fms. Beneatli stones and in rock cavities. 



This species, which Mahngren constituted to receive a 

 single individual received from Bohus, and which M'Intosh 

 has sometimes found in the debris of fishing boats at St. 

 Andrews, is here one of the most constant and abundant 

 of the Polynoinae — present at the greatest depth yet dredged 

 in our local area viz : — 45-57 fathoms, 20 miles N.W. of 

 Holyhead, (" Spindrift" cruise, 20 July, 1889), as well as 

 being taken in profusion on the rocky shores of Puftin 

 Island, Hilbre Island and the Isle of Man. At Puffin 

 Island it is especially plentiful and is undoubtedly the 

 characteristic Polynoe of the island. 



Mahngren' s figures absolutely tally with the majority of 

 my specimens. A few deviate in that the outer edges of 

 the elytra bear a few^ weak and inconspicuous cilia, and 

 occasionally some of the smallest show^ none of the 

 characteristic globose processes on the elytron edge. (PI. 

 XIII, fig. 7). In colour, as in most other points, my 

 specimens agree closely with Malmgren's, while differing 

 markedly from that described by M'Intosh from St. 

 Andrews (Trans. Zool. Soc, vol. IX, p. 875). 



The structure of the bristles is identical with that of 

 those belonging to Polijiioi'jloccosa as figured by jMTntosh. 

 Were it not that all the specimens examined possess 15 

 pairs of el3^tra, the margins of w^iicli are unfurnished with 

 aught save a row of sub-globular processes, in contrast 

 with the more numerous and ciliate elytra of P. floccosa 

 I should incline to unite the two species. (PI. XIII, 

 fic(. 1 and 9). 



