FAUNA OF THE OUTER WESTERN AREA OF THE CHANNEL. 347 



Pomatoceros triqueter (Linnaeus). 



At Positions 6, 7, 80, and probably in several other hauls. 

 Depth, 42-51 fath. 



Hydroides norvegica (Gunn). 



Eecorded at Positions 4, 6, 11, 13, 32, 58. About 50 examples on a 



valve of Pedcn opercularis, at Position 13. 

 Depth, 40-49 fath. 



Ditrupa arietina (0. F. Miiller). 



One specimen at Position 36. 



Depth, 43 fath. 



The species does not appear to have been previously recorded from 

 the English Channel. 



Distribution : Gulf of Naples, Teneriffe, Madeira, Azores, Bay of 

 Biscay, S.W. of Belle Isle, N.W. coast of Ireland, W. coast of Scotland, 

 Shetland, Norway, Philippine Is. — cp. Lo Bianco (88), Langerhans (87), 

 Mcintosh (89, 90),Eoule (98), de St. Joseph (103), Johnston (85), Sars 

 (105), Grube (84). 



Filograna implexa (Berkeley) ? 



At Positions 7, 8, 37. 



Depth, 42-43 fath. 



De St. Joseph (101) distinguishes Filograna imjylcxa, as with oper- 

 cula, from Salmacina dysteri as without them. Cunningham and 

 Eamage * treat the two as synonymous, a view which is shared by Prof. 

 Mcintosh. The specimens which were recorded in the preliminary list 

 as Filograna implexa were unfortunately not retained for examination 

 of this character, and the species is therefore left in doubt. 



Protula tiibularia (Montagu). 



Single specimens at each of the Positions 9, 33, 59, vii. 

 Depth, 42-49 fath. or over. 



Spirorbis spirillum (Linnaeus) ? 



A small Spirorbis, apparently of this species, occurred commonly on 

 Hydroids, especially on Sertularia abietina, at many points, and 

 was definitely recorded at Positions 11, 14, 35, 42, 43, 53, 60, 62, 

 67, 80. 



Depth, 42-51 fath. 



* "The Polychaeta Sedentaria of the Firth of Forth," Trans. Eoy. Soc. Edinburgh, 

 Vol. XXXII, p. 6.35. 



