112 PROCEEDINGS OF THE 



remains of tliis crinoid are often found in a dismembered and 

 fragmentary condition in the limestone quarries of the West of 

 Scotland, but that this specimen which he now exhibited was the 

 finest example of the serrated tapering fingers which he had yet 

 seen, the species being very rarely procured in so perfect a state. 

 The fingers averaged about five inches in length, and at their base 

 showed a portion where they had been attached to the body of 

 the animal. Mr Young also exhibited a large collection of other 

 species of Crinoidece from the neighbourhood of Glasgow, belonging 

 to the following genera:— ~Acti7ioc7inus, Platycrinus, Rhodocrinns, 

 and Hydreionocrinus, and at same time drew the attention of the 

 meeting to a series of bivalve entomostraca, from the same shales 

 at Newfield Quarry, including a number of species, some of them 

 being much more minute than he had yet observed from any 

 other strata in the West of Scotland. 



Dr James Stirton exhibited specimens of Grimmia commutata, a 

 moss new to Great Britain, from Moncrieff Hill, near Perth. Its 

 habitat is within very circumscribed limits, and apparently con- 

 fined to one spot, where it spreads from a centre of growth. It 

 was in a barren state, and, being dioicous, there is little likelihood 

 of its fruiting, more especially as neither male nor female plants 

 have been detected. On the same hill, Dr Stirton had discovered 

 the beautiful Hypnum Crista-Castrensis, and also Hypmim rugosum. 

 Leucodon sciuroides was also discovered in great profusion, and, 

 after diligent search, two or three tufts were secured bearing 

 capsules in an immature state — a fact of some interest, fertile 

 specimens being very rare in this country. Lastly, Tortida inter- 

 media (Bridel), which in several phxces covered the rocks in such 

 dense tufts as to exclude every other form of vegetation. 



PAPER READ. 



On the Siiccession of Geological Changes in Scotland from the Glacial 

 Epoch to the Present Day. By Eev. Henry W. Crosskey. 

 The author stated that the object of his paper was to group 

 together certain facts, the recognition of which is believed to be im- 

 portant for the determination of the modern series of geological 

 changes in Scotland, rather than to elaborate any of those larger 

 generalisations which, in the present state of investigation, must 

 necessarily be tentative; and that the conditions of the pro- 

 blems involved would be more dwelt upon than their solution. 



