FAUNA OF THE OUTER WESTERN AREA OF THE CHANNEL. 339 



The large proportion of small specimens is remarkable. 

 The mollusc Montacuta substriata was attached to some of the speci- 

 mens at Position 46, but it was not recorded in other cases. 



SPATANGIDAE. 

 Echinocardium pennatifidum, Norman. 



Five specimens on rough ground at Position 58. 



Depth, 49 fath. 



Length, 29, 34, 38, 39, 41 mm. respectively. 



HOLOTHUROIDEA. 



CUCUMARIIDAE. 

 Cucumaria brunnea, Thompson. 



At Positions 3 (one), 4 (one), 43 (two). 

 Depth, 40-45 fath. 



Cucumaria hyndmani, Thompson. 

 One specimen at Position 35. 

 Depth, 43 fath. 



Thyone fusus (0. F. Miiller). 



One specimen at each of the Positions 11 and 33. 

 Depth, 42 fath. 



Thyone raphanus, Diiben and Keren. 



One specimen at Position 14. 



Depth, 44 fath. 



Two examples of this species, which has not previously been recorded 

 in the Plymouth fauna, were recently identified by Mr. J. H. Orton 

 from three miles south of Eame Head, where they were obtained in 

 July, 1911. Bell (65) gives as its distribution: British and Norwegian 

 seas and Mediterranean ; with the British localities : Faeroe Channel, 

 570 fath.; Shetland; The Minch; Dingle Bay, 40 fath., off the 

 S.W. coast of Ireland. Also Irish Sea (Herdman, 9). 



ANNELLIDA. 

 POLYCHAETA. 



SYLLIDAE. 

 Typosyllis alternosetosa, de St. Joseph. 



At Positions 14 (one), 33 (one), 38 (two), 43 (one), 45 (one), 52 (one), 



56 (one), 58 (one), 59 (one). 

 Depth, 42-49 fath. 



