POLYCELETA OF THE L.M.B.C. DISTRICT. 237 



named locality from the ambulacral grooves of Astropecten 

 irregularis cast upon the beach. This worm ranges from 

 the Mediterranean to Galway in Ireland. At Naples, 

 Claparede found it in company with Ophiodromus flexuo- 

 sus on Astropecten aurantiacus, while A. aurantiacus, 

 bispinosus, platyacantlius and pentacanthus from Trieste 

 all furnished to Marenzeller (loc. cit.) the same two guests. 



Examples of this worm were identified as M. castanea 

 by Mr. Gibson in his "Report on the Vermes" of this 

 district. I note that in the "Challenger" Report the 

 generic name is spelled Achloe. 



*Halosydna (Alentia) gelatinosa, (Sars). 



A very large specimen was found under a stone at 

 extreme low water at Puffin Island, October, 1887. It 

 measured 6 J cm. by 16 mm. (including the bristles). 



Hermadion assimile, MTntosh. 



Hab : 12 (21 fms.) and 11 (10 frns.). 



One small specimen was found crawling among the 

 spines of an Echinus esculentus dredged from 21 fathoms 

 in the Irish Sea, 25 miles N.W. of Liverpool Bar, and 

 Mr. Gibson recorded two from the same host dredged 

 near Port Erin. 



* Hermadion peUucidiun, (Ehlers). 



Hab : 6, 10, 12, 13, (16-22 fms.) 



This species was taken for the first time locally at Sta- 

 tion 12, (" Spindrift," September, 1890), when three small 

 specimens were dredged. All were commensal with 

 Echinoderms. One was in the ambulacral groove of 

 Astropecten irregularis ; another upon Solaster papposa 

 and the third was upon a brittle-star — Ophiothrix rosula. 

 Marenzeller (loc. cit.) speaks of obtaining a specimen from 

 Ophiothrix alopecurus from the Bay of Muggia, near 

 Trieste. 



One of these specimens was perhaps the most beautiful 



