POLYCELETA OF THE L.M.B.C. DISTRICT. 235 



Polynoe (Lanilla) setosissima, Savigny. 



Hab : Beaumaris. Low water mark, commensal with 

 Chcetopterus insignis, Baird. 



Bay Lankester* records it under the name of Harmothoe 

 malmgreni living with the same host on the shores of 

 Herm, one of the Channel Islands. His remark anent its 

 commensalism — " It appears to be only met with in this 

 habitat" I am able to confirm, as under the guidance of 

 my good friend Mr. J. Sinel, of Jersey, I have dug up in 

 Herm a number of Chcstopteri and have found this Polynoe 

 invariably present. It is the L. glabra of Malmgren. 



* Polynoe (Malmgrenia) castanea, (MTntosh). 



Hab : 7, 12, 13 in 20-22 fms. Commensal with Spat- 

 angus purpureus. 



Every living Spatangus I have examined — and this 

 Echinoderm was several times dredged in considerable 

 numbers on the " Spindrift " cruises 1890 — has had one of 

 these worms clinging to the test close to the mouth. All 

 Prof. M'Intosh's examples were obtained from the same 

 host. The curious fact noted in the first Keport on the 

 Vermes by Mr. Gibson + of finding this worm in the 

 ambulacral groove of Astropecten turns out to be erroneous 

 — for having occasion to refer to Mr. Gibson's specimen, I 

 discovered it to be the ordinary Acholoe astericola, which 

 Carrington recorded long ago as . a common guest of the 

 starfish named. This species is very unlike P. castanea. 



Polynoe floccosa, Savigny. 



Hab : The South of the Isle of Man. 



I give this as a member of our local fauna on Mr. Gibson's 

 authority. I have searched long and carefully for it 

 without success. Prof. Eay Lankester observes that in 

 the Channel Islands this form — his H. sarniensls — seems 



* " On New Brit. Pohjnoina." Trans. Linn. Soc. vol. xxv, 

 t Fauna of Liverpool Bay, p. 149, 



