On a great Ice-sheet in the Lake- district. 313 



2. " On the Traces of a Great Ice-sheet in the Southern part of 

 the Lake-district and in North Wales." By D. Mackintosh, Esq., 

 E.G.S. 



In this paper the author brought forward the evidence which 

 seems to him to establish the existence in the southern part of the 

 Lake-district of a " valley-ignoring and ridge-concealing ice-sheet." 

 With regard to ice-marks, he distinguished between primary striae 

 and those produced at a subsequent period, and stated that in the- 

 Lake-district the direction of the primary striae generally coincides 

 with that of the action by which roches m,outonnees have been pro- 

 duced. He gave a table of the direction of ice-marks observed by 

 him in the district under notice, and stated that about Windermere 

 and Ambleside the general direction is nearly N.N.W., round Gras- 

 mere between N.W. and N.N.W., north-west and west of Grasmere 

 in upland valleys and on high ridges about N. 30 Q W., south of Gras- 

 mere and in Great Langdale N. 35° W., and in the Coniston district 

 a little W. of N. In many places he recognized an uphill march of 

 the ice. He thought that the iceflow producing these marks 

 might be anterior to the flow from south to north, of which traces 

 are observed in the northern part of the Lake -district, and that 

 its source was probably a vast mass of ice covering many square 

 miles of country north of Far Easdale. The author also referred to 

 the glaciation of North Wales, some of the marks of which, observed 

 by him in a district south of Snowdon, seemed to him to indicate the 

 southerly movement of a great ice-sheet capable of ignoring or 

 crossing deep valleys. He noticed that towards the top of the pass 

 of Llanberis there is a thin covering of drift on the S.W. side, 

 resembling the gravelly pinnel of the Lake-district. He also men- 

 tioned the occurrence near Llyn Llydan of numerous mounds 

 composed of clay, sand, and fine gravel, the stones having generally 

 been rolled by water, and ascribed their formation to a combination 

 of glacial and marine actions. 



3. " Notes on some Lamellibranchs from the Budleigh-Salterton 

 Pebbles." By Arthur Wyatt Edgell, Esq., E.G.S. 



In this paper the author commenced by noticing the accordance 

 between many of the pebbles of Budleigh Salterton and beds occur- 

 ring on the opposite side of the channel in Brittany, and then de- 

 scribed several species of Lamellibranchiata found in the Budleigh- 

 Salterton pebbles. The species described were : — Modiolopsis ar- 

 morici (Salter), M. Lebesconti, sTp.n^ScmguinoKtes?, sp. (contortus ? , 

 Salter), Aviculopecten Tromclini, sp. n., Ptcrincea retraflcva (Hi- 

 singer) and three other species, Palcearca, sp., Avicula, sp., Cleido- 

 phorus ?, sp., Lunulocardium ventricosum, sp. n., Ctenodonta, sp., and 

 Orihonota ?, sp. 



