POLYCHiETA OF THE L.M.B.C. DISTRICT. 150 



Williams' specimens gathered from extreme low water at 

 Beamiiaris are now in the British Museum. Examina- 

 tion of the large specimen of " Sjjioclio'topterus typicus, 

 Sars," described by Mr. K. J. H. Gibson (loc. cit.) as 

 obtained at Beaumaris shows it to be in reality an example 

 of C. insignis. 



Nychia clrrosa and Polynoi' glabra — one or other — are 

 usually present in the tubes as commensals ; N. cirrosa 

 more frequently of the two in this district ; P. glabra {H. 

 malmgreni of Ray Lankester) in the Channel Islands.* 



Our local species is identical with specimens from 

 Herm, Channel Islands. The species differs from 

 Quatrefages' C. valencinii procured from St. Malo, in 

 that the latter shows a bundle of black bristles on the 4th 

 and 5th pairs of feet, whereas the Herm and the Beaumaris 

 specimens have these on the 4th pairs of feet only. 

 Quatrefages' species has also a larger number of segments 

 in the posterior section of the body. A Herm specimen 

 procured for me by Mr. Sinel of Jersey had about 21 

 segments in this part. 



Family. — Chlorh.emid^ . 



*Troplionia p)lumosa, (Miiller). 



Hab : f), 9, P. A few small specimens from 5 fathoms 

 off Puffin Island ; numbers from the deep water (45 — 57 

 fathoms) betw^een Anglesey and the Isle of Man. 



Parasitic thecate infusoria are occasionally to be seen 

 on the head tuft of bristles and also much minute fila- 

 mentous matter similar to that clogging the dorsal bristles 

 and the fimbriae of the elytra of Lepidonotus squamatus. 



Siphonostoma cUplochaitos, Otto. 



Hab: H, P, 6, 7, 9. 



The S. gelatinosuin of Mr. Gibson's previous local list. 

 It is more frequently taken on the littoral than Trophonia 



* On soiiio new Biitisli Polvnoina. 1866. 



