WORKS ON GEOLOGY, MINKEALOGY, AND PALAEONTOLOGY OF WALES. 417 



Porth-Treiddyn in Carnarvonshire. Proc. Geol. Soc. vol. iv. p. 370, and 

 Quart. Journ. Geol. Soc. vol. i. p. 153. (1845.) 



(271) FoKBES, Prof. E. On two Fossil Species of Criseis (?). Proc. 

 Geol. Soc. vol. iv. p. 362, and Quart. Journ. Geol. Soc. vol. i. p. 145 

 (1845). 



(272) Sedgwick, Rev. Prof. A. On the Older Palasozoic Rocks of 

 North Wales. Proc. Geol. Soc. vol. iv. p. 251, and Quart. Journ. Geol. Soc. 

 vol. i. p. 1. (1845). A slight difference between pp. 17-20 and 263-6. 



(273) Smith, W. Memoirs of, by Prof. J. Phillips. 8vo. Lo7id. 

 (p. 62). 



1845. 



(274) Deax, a. Notice respecting the Discovery of Gold Ores in 

 Merionethshire, North Wales. Eep. Brit. Assoc, for 1844, Section; p. 56. 



(275) Observations on the Stratification of Igneous and Sedi- 

 mentary Rocks of the Lower Silurian Formation in North Wales. Ihid. 



(276) DelaBeche, Sir H. T. Notes concerning a Section through 

 the Silurian Rocks in the Vicinity of Builth. Ibid. p. 46. 



(277) Macintosh, A. P. On the Supposed Evidences of the former 

 Existence of Glaciers in North Wales. Proc. Geol. Soc. vol. iv. p. 594, 

 and Quart. Journ. Geol. Soc. vol. i. p. 460. 



(278) Sedgwick, Rev. Prof. A. On the Comparative Classification of 

 the Fossiliferons Strata of North Wales with the corresponding deposits 

 of Cumberland Westmoreland and Lancashire. Proc. Geol. Soc. vol. iv. 

 p. 576, and Quart. Journ. Geol. Soc. vol. i. p. 442. 



(279) Trevelyan [Sir] W. C. Letter on Glacier Marks in North 

 Wales. Proc. Geol. Soc. vol. iv. p. 482, and Quart. Jotirn. Geol. Soc 

 vol. i. p. 300. 



1846. 



(280) Davis, J. E. On the Geology of the neighbourhood of Trema- 

 doc, Caernarvonshire. Quart. Journ. Geol. Soc. vol. ii. p. 70. 



(281) Dickinson, J. On the Strata called ' Jackstones' at Merthyr 

 Tydvil. Ibid. p. 131. 



(282) Sharpe, D. Contributions to the Geology of North Wales 

 Ibid. p. 283. 



1847. 



(283) Johnson, C. Infusorial Deposit at Dolgelly, North Wales. 

 Ann. Nat. Hist. vol. xix. p. 425. 



(284) MuECHisoN, Sir R. I. On the Silurian and Associated Rocks in 

 Dalecarlia, &c. — ' Conclusion,' on the Classification, &c. of the older rocks. 

 Qiiart. Journ. Geol. Soc, vol. iii. p. 36. 



(285) Remarks on Silurian and Cambrian Classification. SuU. 



Soc. Geol. France, 2 ser. t. iv. p. 766. 



(286) Richardson, J. On the Ventilation of Mines. (Sections of 

 South Wales Collieries, Mynnyd Caeran and Llanquicke, pp. 180, &c.) 

 Proc. List. Civ. Eng. vol. vi. p. 160. 



(287) Rowlandson, T. Agriculture of North Wales [with an account 

 of the Geology and Soils]. Journ. Boy. Agric. Soc. vol. vii. p. 553. 



(288) Sedgwick, Rev. Prof. A. On the Classification of the Fossili- 



ferous Slates of North Wales, &c Quart. Journ. Geol. Soc. vol. iii 



p. 133. 



(289) Sharpe, D. . On Slaty Cleavage. Ibid. p. 74. 

 1880. E E 



