BIOLOGICAL RESULTS OF THE " ARGO " CRUISE. 201 



case in point ; but I know of no Actinian which has this 

 habit in so marked a degree as has the above species. I 

 cannot at present say whether this is a constant character 

 or whether it has a purely seasonal significance." 

 Car yophy Ilia borealis, off Killeany, Arran Ids., 24 fms. 



Ctenophoea. 

 Pleurobrachia, (sev. sp.) in great abundance round the coast. 



ECHINODEKMATA. 



Astropecten irregidare, Penn. 



Luidea sarsii, Dub. and Kor. (?), trawled off Killeany, 



Arran Ids. 24 fms. 

 Asterina gibbosa, Inishbofin, low tide. 

 Ophiothrix pentaphyllwm, Penn. 

 Ophiocoma nigra, Abild. 

 A mphiura filiformis, Forb. 

 Ophioglypha lacertosa, Linck. 



0. albida, Forb. 



Echinus esculentus, Linn. 



E chinocy amies pusillus, Miill., many, off Dursey Head. 

 Holothuria nigra, Peach. 

 Cucumaria hyndmani, Forb. 

 Ocnus brunneus, Forb. 



The only one of these species which calls for further 

 remark is : — 



Holothuria nigra, Peach. 



This is the "nigger," or "cotton spinner" of the 

 Cornish fishermen, a form which has usually been con- 

 sidered very rare, and was not recorded as British until 

 recently. It is known now from several points on the 

 southern and western coasts of Ireland and the southern 

 coast of England. It belongs to the group of Aspido- 

 chirotse, forms with 20 shield-shaped tentacles, and is the 

 only representative of that set known to inhabit British 



