184 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



in reality to Pallas' Aph. cirrosa, the remainder pertaining 

 to P. setosissima, 8av. {Lcenilla glabra, Mgrn.). Both 

 species had been found living commensal within the tubes 

 of Gha'topterus insignis, Baird. Curiously enough, the 

 first example I obtained was dredged from 5 fathoms in 

 the Menai Straits within a few miles of the spot whence 

 came Baird' s specimens in 1864. It came up from ground 

 covered with the valves of dead mussels, and when first 

 noticed it was crawling from the broken end of a Terehella 

 tube, probably Thelepus cincinnatus — thus denoting a w^ider 

 range of its commensal habit. The Iphione muricata of 

 Mr. Gibson's report is this species, as I can certify from an 

 examination of the original very fine specimen now in the 

 Zoological Museum of University College, Liverpool. 



Poly nor (Harniotho(') imhricata, (Linn.). 

 Hab : 6, P. M, Mp, under stones. Abundant at low water. 



But few of my specimens were dredged, and these 

 were from shallow water; the great majority were shore 

 collected. Hj. Theel however records dredging it as deep 

 as 80 — 100 metres.* The species is predominant and 

 exceedingly abundant under stones on the south side of 

 Port Erin Bay, attracted and provisioned — directly or 

 indirectly — by the large quantity of fishing refuse present 

 at the quay. In colouration of the elytra P. imhricata is 

 the most variable of our Polynoinae — from black and blue- 

 black it grades to grey and light rose. Usually the 

 colouration is more or less over the whole surface of the 

 elytron, but sometimes it is restricted to the inner third 

 or half of each elytron leaving the outer portion colourless. 

 Several Puffin Island specimens and others from Port 

 Erin with this peculiar marking are especially beautiful. 

 The inner black margins of the elytra to the eye appear to 

 coalesce and thus give the animals the appearance of having 



' ''Les Ann. ])olycli. des Mur.s de la X. Zcnililc." 1879. 



