Notices of Memoirs — Seward's Jurassic Flora of Sutherland. 175 



the implements of the Oronsay shell-mound and those of the Asylien 

 and Arisien of France. These names have been given by Piette to 

 strata occurring in the cave of Mas d'Azil between deposits of the 

 Reindeer Period and purely Neolithic deposits with polished axe-heads. 

 The Asylien yields flat harpoon points of stag's horn to which those 

 of Oronsay bear a considerable resemblance. In the overlying Arisien, 

 and also in the still higher purely Neolithic strata, there occur pebbles 

 and slabs of slate, which are polished to a cutting edge either at the 

 end or at one side. These implements are regarded by Piette as 

 foreshadowing the polished axe-heads of the Neolithic Period. The 

 bevel-ended pebbles of Oronsay and of the Balnahard Neolithic floor 

 in Colonsay certainly bear a resemblance to these, but, even when 

 taken in association with the occurrence in Oronsay of the Asylien 

 type of harpoon-head, they can hardly be regarded as sufficient evidence 

 of an early stage of Neolithic culture in the islands. 



Finally, the evidence of the connexion of the Neolithic floor of 

 Balnahard with a higher level of the sea is of a negative kind, and 

 could not stand by itself. Were it not that a similar relation is 

 observable in other parts of Scotland and Ireland, no special significance 

 could be attached to it. 



NOTICES OIF MEMOIRS. 



The Jurassic Flora, of Sutherland. 



UNDER this title Professor A. C. Seward has given a general 

 account of Scottish Jurassic plants, most of which have been 

 obtained from Sutherland, and a particular account of the flora of the 

 Upper Oolites of that county, based on materials collected by the late 

 E,. Marcus Gunn, F.R.C.S. (Trans. Roy. Soc. Edin., vol. xlvii, pt. iv, 

 1911). The formations from which plants have been obtained in 

 Sutherland are : (1) Lower Oolites, including the Brora Coal Series of 

 Great Oolite age, and possibly beds of Inferior Oolite, as suggested by 

 Miss Stopes; (2) the Corallian Sandstone of Clyneleish Quarry, Brora, 

 which has yielded in abundance casts of Cycadean stems described 

 by Mr. Carruthers under the names of Bucklandia and Yatesia, but 

 placed under the former genus by Professor Seward; (3) the Upper 

 Oolites, between Kintradwell, north of Brora, and Helmsdale, 

 Navidale, etc. The specimens in the collection of Mr. Gunn were 

 obtained by him almost wholly from this last series, and mainly from 

 Culgower Bay, in beds of Ivimeridgian age. 



The new forms described by Professor Seward are as follows : — 

 PTEEIDOPHYTA. Coniferales. 



Filicine^E. Araucarites Milleri. 



Hausmannia Bichteri. Masculostrobus Zeilleri, gen. et sp. 



Gleichenites Boodlei. nov. 



Marattiopsis Boioeri. Taxites Jeffreyi. 



Rhizomopteris Gunni. 

 Sphenopteris onychiopsoides. Cycadophyta. 



GYMNOSPEEMiE. Pseudoctenis crassinervis, gen. et sp. 



Ginkgo ales? nov ' 



Phcenicopsis Gunni. 



