THE HYDROID FAUNA OF THE WEST OF SCOTLAND 225 



72. AGLAOPHENIA PLUMA (Linn.). 



CLYDE SEA AREA. DUNOON BASIN E. side, 8-42 fms., m.c. (M.). 

 FIRTH OF LORNE, 50-110 fms. (M.). 



73. AGLAOPHENIA TUBULIFERA (Hincks). 



CLYDE SEA AREA (M.). DUNOON BASIN E. side, 16-20 fms., 

 m.c. ; centre, 20 fms., r. ARRAN BASIN Kilbrennan Sound, 

 Otterard to Carradale, 15-20 fms., r. 



MULL OF CANTYRE, 64 fms., many colonies. 



FIRTH OF LORNE three records between 30 and no fms., with 

 corbul^e, c. 



THECOCARPUS, Nutting. 



From the genus Aglaophenia there have been separated and 

 placed in Thecocarpus such species as possess a hydrotheca at the 

 base of each leaflet of the phylactocarp, or corbula, in which the 

 reproductive bodies are protected. Such species are also to be 

 distinguished by the insignificance of the lateral teeth of the 

 hydrothecal margin. 



74. THECOCARPUS MYRIOPHYLLUM (Linn.) 



(^ Aglaophenia myriophyllum of Hincks's "History"). 



CLYDE SEA AREA. DUNOON BASIN (M.), 20-40 fms.; Warden 

 Bank, 8 fms. KYLES OF BUTE, off Tighnabruaich. ARRAN 

 BASIN (M.) Kilbrennan Sound, 10-15 fms.; below Isle of 

 Ross, 12-14 fms. ; Kildalloig Bay, Davarr Is., 15 fms. ; Davarr 

 Is. to Brown Head, Arran, 17-30 fms. BARRIER PLATEAU 

 Ailsa Craig, 24 fms. 



SANDA Is., 4 miles S.E., 30-35 fms. (M.). 



MULL OF CANTYRE, 49 fms. 



FIRTH OF LORNE, 10-30 fms. ; 60-70 fms. 



HALICORNARIA, Busk. 



Halicornaria is distinguished from Aglaophenia by the arrange- 

 ment of the gonangia, which are entirely unprotected by any 

 special developments of the hydroclades. According to Nutting, 

 further distinguishing marks of the genus occur in the trophosome, 

 the chief of these being the presence of an anterior intrathecal 

 ridge, and the absence of septal ridges in the internodes. 



75. HALICORNARIA PENNATULA (Ell. and Sol.) 

 ( Aglaophenia pennatula of Hincks's " History "). 



CLYDE SEA AREA. ARRAN BASIN Kilbrennan Sound (M.). 

 80 



