1873.] MACKINTOSH REMARKABLE BOULDEES. 351 



Horizon. Middle Lias, Raasay, Yorkshire, Gloucestershire. Most 

 abundant in the zone of Ammonites Jamesoni, hut passing up into 

 that of " A. spinatus," Cleveland, Yorkshire. 



EXPLANATION OF PLATE XII. 



Fig. 1. Cyrena (Miodon) Brycei. 



a. Exterior, left valve, nat. size. 



b. Interior, left valve. 



2 a & 2b. Corbula hebridica. Eight and left valves, enlarged. 



3. Paludina scotica. Adult, nat. size. 



4. Lcptoxis trochiformis, enlarged. 



5 a & 5b. Melania'i inermis, slightly enlarged. 



6. Neritina staffinensis, 1 i .„ i 



7. arata, J en ai&e ' 



8 a & 8 b. Hydrobia caledonica, enlarged. 

 9. Valvata precursor, enlarged. 



10 a & 106. Cyrena cucidlata, nat. size. 



1 1 a. Potamomya robusta, nat. size. 

 116. Umbo. 



12. Anomia (Bstuarina. 



13. Belemnites pectinatus. Figures all of the nat. size. 



a. Ventral aspect of guard. 



b. Lateral aspect of guard. 



c. Transverse section towards apex of phragmacone. 



d. Extreme apex. 



14a & 146. Bdemites confertus. Lateral aspect of guard, and transverse 

 section. 



Discussion. 



Mr. Judd pointed out that, contrary to the views of that school of 

 geologists of "whom Dr. Macculloch was the leader, and which re- 

 garded the geological investigation of Scotland as almost completed, 

 that work was only now being commenced by the application of 

 those principles of Palseontological geology which had been deve- 

 loped in England, and especially fostered by the Geological Society* 

 He congratulated Dr. Bryce on having secured the aid of so experi- 

 enced a palaeontologist as Mr. Tate, and bore witness to the fidelity 

 with which his sections, especially those of the Island of Skye, were 

 described. He also pointed out the importance of this commu- 

 nication as completing the history of a series of sections first so 

 well sketched by Murchison, and in parts described in detail by 

 Geikie, Wright, and Edward Forbes. 



2. Observations on the more remarkable Boulders of the North- 

 west of England and the Welsh Borders. By D. Mackintosh, 

 Esq., F.G.S. 



[Plate XIII.] 



It is presumed that, at a time when so much is said about the con- 

 servation of Boidders, a number of personal observations on these 

 interesting objects may not prove unacceptable to the Geological 

 Society. 



Westmoreland. — The Shapfcll boulders first claim our attention, on 



2a2 



