XYLOPHAGA. 121 



impressed by the line of demarcation between the strise on the 

 anterior side : pallial sew narrow, withdrawn and deeply 

 sinuated on the posterior side : muscular scars well marked ; 

 posterior oval and large ; anterior covering the fold of the 

 hinge-plate on that side. L. 0-375. B. 0-4. 



Habitat : Oak, pine, and birch wood, submerged 

 between tide-marks or floating in the sea, on different 

 parts of the coast from Unst to Torbay. Although its 

 distribution is extensive, it has not been noticed in 

 many localities. I will therefore enumerate them. Tor- 

 bay (Turton) ; Exmouth (Clark) ; Gravesend (Crouch) ; 

 Scarborough (Bean and J. G. J.); Northumberland 

 and Durham coast (Backhouse and Abbes, fide Alder) ; 

 Marsden Bay on the Northumberland coast (Howse) ; 

 Bantry Bay and Waterford (Humphreys) ; Skerrie 

 Islands in the south of Ireland (Walpole) ; Dublin Bay 

 (Harvey and Warren) ; Loch Fyne (M*^ Andrew) ; 

 in dock gates at Ardrossan, Ayrshire (Martin) ; Moray 

 Firth (Macdonald) ; in a wooden shipping- stage at the 

 Whalsey Skerries, Shetland, and a single valve dredged 

 in 80 f., 30 miles north of Balta Sound (J. G. J.). It 

 has also been taken at Drontlieim in 30-40 f. by M^An- 

 drew and Barrett; at Drobak in 10-15 f. by Asb- 

 jornsen ; at Bergen and Christiansund by Lilljeborg ; 

 in other parts of Norway by Loven; on the coast of 

 Bohuslan in 22 f. by Malm ; in the Cattegat by Morch ; 

 at Brest by Dr. Daniel; in the Gulf of Lyons by H. 

 Martin ; and Professor Huxley gave me young speci- 

 mens which had penetrated the outer coating (tarred 

 hemp) of the Mediterranean electric telegraph cable on 

 the coast of Spain at a depth of from 60 to 70 f. ; some 

 of these last were about to attack the gutta-percha tube, 

 that formed the inner case or covering of the wire, 

 when the cable was taken up. 



VOL. III. G 



