120 Pi'of. Hughes, Cr-iticism of the Geological [Oct. 30, 



the three points on a Delft plaque, indicating where it rested upon 

 its tripod in the firing. 



14. Corner of a rock of Mountain Limestone exposed to the splash 

 of a small waterfall. This specimen shows a fretted surface. 



15. Piece of gypsum dug out of damp marl and showing fretted 

 surface. Little Salkeld quarry, near Penrith, Cumberland. (See 

 also two larger specimens in the Museum.) 



16. Basalt polished and fretted by blown sand. West of Spa Point, 

 Burntisland, Edinburgh. 



17. Quartzite pebble projecting from surface of Cambrian con- 

 glomerate and fretted by blown sand. Top of cliff, east of 

 Porth Seli, St Davids. Two specimens. 



18. Sand-worn stone from Western side of entrance to harbour of 

 Wellington, Cook's Straits, Southern end of North Island, New 

 Zealand. 



19. Another specimen in which veins of harder material project. 



20. Pebble worn by blown sand. Top of Plateau gravel, Biarritz. 



21. A large slab of red sandstone smoothed and striated : from the 

 glaciated surface of the solid rock near Edinburgh. 



22. Large boulder of chalk from the Glacial Drift of Roslyn Pit, Ely. 



23. Small boulder of black limestone from the great moraine of 

 Lausanne, Switzerland. 



24. Boulder of Silurian rock from the lower Till, Longwathby cutting, 

 Settle and Carlisle Railway. 



25. Do. from clay drift 1800 feet above sea level. Top of great 

 Swindale, Weasdale, Ravenstonedale, Westmorland. (29 S.E.) 



26. Boulder of Shap granite from the Eden Yalley. 



27. Fragment of limestone which had been bored by lithodomous 

 molluscs and was afterwards glacially striated. Boulder Clay, 

 N.W. of Greenore Point, Wexford. 



28. Piece of large mass of Jurassic limestone which projected in the 

 path along which timber was dragged. Road up Jui^a from 

 Grenchen to Burenberg, Canton Solothurn. 



29. Do. do. 



30. Rock scratched by dragging timber over it. Bonwmuchaf, Corwen. 



31. Do. do. 



32. Surface of bed striated by fragments sliding over it from the 

 top of the quarry. Rhiwallt, St Asaph. 



33. Do. do. 



34. Mountain Limestone polished and grooved by passage of wire 

 rope over it. Arco Wood Quarry, Horton-in-Ribblesdale. 



35. Do. do. 



36. Rock scratched and polished by boys sliding down it at right 

 angles to the direction of the glacial striae, which are obliterated 

 on this specimen. Rhosygwaliau, Bala, N. Wales. 



37. Limb bones of Pliosaurus from Littleport, with cuts (teeth 

 max'ks?). Compare No. 39. 



38. Do. 



39. Nodule of Phosphate of Lime from the Cambridge Greensand, 

 with Plicatula sisillina sri'owina over small cuts and ijrooves. 



