FAUNA OF THE OUTEK WESTERN AREA OF THE CHANNEL. 373 



FILIBRA.NCHIATA. 

 ANOMIIDAE. 

 Anomia ephippium, Linnaeus. 



I have thought it best to include under this one species all the 

 specimens of Anomia that were recorded. Though it is possible 

 that A. imtclliformis occurred among them, it was very difficult to 

 distinguish among the extremely irregular forms assumed by the 

 specimens any definite external characters, such as those assigned 

 to the latter form by Jeffreys (147). The shape and moulding 

 of the valves seemed in all cases to be merely dependent on that 

 of the base of attachment. 

 Specimens were definitely recorded, sometimes in considerable 

 numbers, at Positions 1, 3, 4, 7-15, 19, 31-36, 43, 44, 46, 49, 



52, 53, 56, 59, 60, 64, vii, 72. 

 Depth, 40-50 fath. or over. 



Attached to shells of other molluscs, more frequently Peden, and to 

 other bodies, especially stones on the rougher ground, it was one of 

 the commonest and most generally distributed species that occurred. 



AECIDAE. 

 Pectunculus glycimeris (Linnaeus). 

 At Positions 6, 7, 10, 14, 16, 17, 19, 32, 33, 36, 37, 43, 44, 46, 51, 



53, 58. 

 Depth, 40-49 fath. 



At Position 7, only old valves occurred. Excepting at Positions 10, 

 14, 16, 17, 19, and 43, the specimens obtained were all of a remarkably 

 small size. 



Area tetragona, Poli. 



At Positions 34, 43 (two), 55, vii (one). 

 Depth, 42-49 fath. or over. 



MYTILIDAE. 

 Volsella modiola (Linnaeus). 



At Positions 1 (one dead), 11 (one living). 

 Depth, 40-42 fath. 



Volsella barbata (Linnaeus). 

 At Position 4 (one). 

 Depth, 40 fath. 



