236 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



to take the place of P. imbricata so common in more 

 northern localities. 



Polynoe (Harmothoe) liinulata, Delle Chiaje. 



Hab : Southport. 



Found in company with P. astericola D.Ch., occupying 

 the ambulacral grooves of Astropecten irregularis cast 

 ashore by storms. 



* Polynoe johnstoni, Marenzeller. 



Hab: 8, 10 (numerous). 



During the " Hyasna " expedition, Whitsuntide, 1890, 

 nearly every haul of the dredge (12-20 fathoms) off the 

 S.W. coast of Holy Island, Anglesey, brought up at least 

 one specimen of this Polynoe. In one case, an individual 

 emerged from an inhabited tube of Thelepus cincinnatus, 

 suggesting another instance of the habit of commensalism 

 so frequently noticed among the Polynoina. Quatrefages 

 was the first to point out the presence of certain differences 

 between Johnston's and Savigny's P. scolopenclrina. 

 Subsequently Marenzeller (loc. cit.) gave this belief definite 

 form, by separating the two and giving separate diagnoses 

 of each thus : — 



P. scolopenclrina, Savigny. Tentacle much shorter 

 than the palps. The tentacular cirri longer than the 

 palps. No wart-like tubercles projecting from the dorsum 

 of the segments. 



P. johnstoni (the P. scolopenclrina of Johnston, Malm- 

 gren and M'Intosh.) The tentacle longer than the palps. 

 The tentacular cirri shorter than the palps. Three wart- 

 like tubercles on the dorsal aspect of each segment. 



Acholoe astericola, (Delle Chiaje). 

 Hab : — Southport, and 6 m. N. of Gt. Ormes Head 14 fms. 



I have to thank Dr. G. W. Chaster, of Southport, for a 

 number of specimens of this interesting annelid which, 

 together with P. lunulata, he procured in the above 



