THE HYDROID FAUNA OF THE WEST OF SCOTLAND 221 



In addition I have included a few species collected by 

 Dr. Oswald Fergus of Glasgow, Dr. J. N. Marshall of 

 Rothesay, and myself, in the Kyles of Bute, off Tighna- 

 bruaich and the Burnt Isles, amongst these being the boreal 

 TJniiaria tenera, a species hitherto unknown to British lists. 



In these records there has been given, even in the case 

 of common forms, every locality at which a species was 

 obtained ; but for this seeming triviality there need be no 

 apology in days when the necessity for the closer and more 

 detailed intensive study of the distribution of marine animals 

 has been recognised. In order to simplify reference, however, 

 I have grouped the records ; those from the Clyde Sea area 

 being arranged as in the scheme adopted in the British 

 Association handbook mentioned above and shown on the 

 map which accompanies that volume. In recording epizoi'c 

 forms the name of the host species has invariably been 

 stated where it was known, in the hope that accumulation of 

 evidence may reveal some constancy of association between 

 epizoon and host ; for in discussing the Hydroid fauna of the 

 Mergui Archipelago, I have already shown that all Hydroid 

 species are not equally subject to infestation by extraneous 

 Hydroid growths. Synonyms have been inserted where the 

 recognised name of a species has altered since Hincks wrote 

 his classical " History of the British Hydroid Zoophytes " 

 (1868), but it has been considered necessary to refer the 

 reader only to the name made use of by Hincks. 



The collections made from the " Medusa " contained 

 representatives of 75 species : 14 Gymnoblastea, 61 

 Calyptoblastea. Three of the latter are worthy of special 

 mention as being recent additions to the fauna of Britain. 

 ParascypJius simplex (Lmx.), from between Sanda Island and 

 Ailsa Craig, has not hitherto been found in the North 

 Atlantic Ocean, and for this species I have found it expedient, 

 on account of its Campanularian habit associated with its 

 Sertularian hydranth, to institute a new genus. Thuiaria 

 tenera (Sars) is not to be found in any British list, though, 

 strange to say, a specimen from " Great Cumbray " exists in 

 the Vienna Natural History Museum, its presence there 

 having been recorded by Marktanner-Turneretscher in 1890. 

 The addition of Polyplumaria flabellata, Sars, to the British 



