344 Proceedings of the Royal Physical Society. 



Mr Jamieson, in his paper,* gives an analysis of the 

 MoUusca from the Caithness boulder clay by J. Gwyn 

 Jeffreys, F.R.S., who comes to the following conclusions : 



61 per cent, are species now living on the west coast of Europe to 



the south of iat, 50°.+ 



V. MOKAINES AND GrAVELS. 



An interesting feature connected with the glaciation of 

 Caithness is the development of moraines and morainic 

 deposits in several parts of the county. Hitherto they have 

 not been described. In Strathmore they are well developed, 

 and they stretch far down the valley to the edge of the great 

 plain. The most easterly limit of the moraines and gravels 

 is at Dalemore, about a mile to the East of Dirlot Castle. 

 This point is situated about fourteen miles from the county 

 boundary at the head of the strath. Near Westerdale, about 

 a mile to the north of Dirlot, the grey shelly boulder clay 

 forms a great plain, through which the Thurso river has cut 

 a channel, and formed an alluvial terrace. This platform of 

 boulder clay is dotted over with conical heaps and ridges 

 of sand and gravel, at a height of 200 feet above the sea. 

 Sections of these heaps are exposed by the roadside on the 

 way to Dirlot, which show that the material consists of sand 

 and gravel, more or less stratified, with occasional blocks of 

 conglomerate and sandstone, measuring 3 feet across. Indeed, 

 the sections closely resemble the kame series of the midland 

 counties of Scotland. One of these ridges is specially note- 

 worthy on account of its length, extending from the farm- 



* Quart. Jour. Geol. Soc, pp. 278-280. 



+ Since the analysis was published (1866) the French explorations in the 

 Bay of Biscay will no doubt have added to the percentage of the species 

 coming under this category. 



