MARINE BIOLOGICAL STATION AT PORT ERIN. 19 



" From this account it will be seen that the mode of 

 development of Ophiopluteus compressus, whilst retaining 

 traces of that usually found in Ophiuroids, is as a whole 

 much more like that of Echinoids. 



" A few specimens of the epauletted Ophiopluteus 

 noted in my last year's report were again obtained. They 

 are probably identical with Mortensen's Ophiopluteus 

 henseni, a species described from a single specimen from 

 Bermuda in the report of the German plankton expedi- 

 tion. The absence of the skeleton in Mortensen's 

 specimen, however, must make any identification a little 

 uncertain. 



" The following Polychaets, all from under stones 

 and Laminarian roots at Poyllvash, are, I believe, new to 

 the L.M.B.C. area: 8 phaerodoriim sp., Nematonereis sp., 

 Staurocephalus sp., Scoloplos (Theodisca) mamillata 

 (Clap.) also found in Port Erin Bay below the Biological 

 Station, Polydora caeca ((Erst.), and Dodecaceria (?? con- 

 charum, (Erst.). 



'" Afi all these worms were obtained in two short 

 visits, a full investigation of the locality would probably 

 yield many more new forms. 



"Amongst the Laminarian roots a small specimen of 

 the locally rare Phascolosoma vulgare was found, and 

 a smaller Gephyrean was fairly abundant. The specimens 

 of the Latter are maggot-like creatures, 5-8 mm. in 

 length, with an introverl of about 4-6 mm. The lopho- 

 phore is represented, as in the genus Petalostoma, only by 

 a paii- of lobes which, however, vary a greai deal in 

 distinctness, and often appear to be entirely absent. 

 Moreover, the Poyllvash species differs From (he type 

 (P. minutum, Etef.) in having only two instead of four 

 retractors. 



"As no Investigations of the worm parasites of the 



