32.2 BRACHIOPODA OF THE 



papers are of considerable interest, as they show how many differences in opinion have 

 been entertained, and the numerous endeavours made to solve that most difficult question 

 of the situs of the parent rocks whence this vast accumulation of boulders was 

 derived. So like, indeed, are these pebbles to each other in external aspect, colour, and 

 mineral composition, that the geologist could not separate those belonging to either of 

 these geological periods were it not for the fossils that a very small proportion of them 

 contain. These are, however, the exception, and not the rule, when the great bulk of 



Tamworth Nat. Hist., Geol., and Antiquarian Soc, vol. i, part i, p. 41, &c. (Eead to 



the Society in Nov., 1871, published in 1874.) 

 1874. A, Wyatt-Edgell. Notes on some Lamellibranchs of the Budleigh-Salterton Pebbles — 



Quart. Journ. Geol. Soc., vol. xxx, p. 45. 

 18/5. Whitaker. List of Works on the Geology of Cornwall — Journ. of the Royal Institution of 



Cornwall, No. xvi. 



1876. W. A. E. Vssher. On the Triassic Rocks of Somerset and Devon, part i — Quart. Jouru. 



Geol. Soc, vol. xxxii, p. 367. 



1877. W. A. E. Vssher. A Chapter on the Budleigh-Salterton Pebbles — Trans. Devonshire Assoc. 



for the Advancement of Science, vol. ix, p. 222, 1877. 



1878. W. A. E. Ussher. The Chronological Value of the Pleistocene Deposits of Devon — Quart. 



Journ. Geol. Soc, vol. xxxiv, p. 449, August, 1878. 

 1878. W. A. E. Ussher. On the Chronological Value of the Triassic Strata of the South-western 



Counties — Quart. Journ. Geol. Soc, vol. xxxiv, p. 459. 

 1878. Etheridge. Discussion after the reading of Mr. Ussher's paper on the Chronological Value of 



the Triassic Strata, &c — Quart. Journ. Geol. Soc, August, 1878. 

 1878. W. Whitaker. Ditto— Quart. Journ. Geol. Soc, vol. xxxiv, p. 469, 1879. 

 1878. Prof. Hughes. Discussion following the reading of Mr. Ussher's paper — Quart. Journ. Geol. 



Soc, vol. xxxiv, p. 470, 1878. 

 1878. Pengelly. The Gorran Beds and the Budleigh-Salterton Pebbles— Geol. Mag., new ser., 



vol. v, p. 238. 

 1878. S. G. Perceval. On Orthis redux in the Midland Bunter Pebbles — Geol. Mag., new ser., 



vol. v, p. 333 ; also two letters in the Exeter and Plymouth Gazette, August, 1877. 

 1878. W. A. E. Ussher. On the Mouth of the River Exe— Trans, of Devon. Ass. for 1878. 

 1878. Townshend M. Hall. Sketch of the Geology of Devonshire— White's History, Gazetteer, and 



Directory of the County, p. 64. 



1878. J. H. Jennings. On the Origin of a Quartzite Boulder from the Bunter Conglomerate, Not- 



tingham — Geol. Mag., new ser., vol. v, p. 239, 1878. 



1879. W. J. Harrison. Fossiliferous Bunter Pebbles in the Drift— The Midland Naturalist, vol. ii, 



p. 283, Nov., 1879. 

 1879. Pengelly. On the Metamorphosis of the Rocks from Hope Cove to Start Bay — Dev. Assoc. 

 Meeting at Ilfracombe, July, 1879, and Trans, of Devon. Assoc, 1879. 



1879. W. A. E. Ussher. On the Triassic Rocks of Normandy — Quart. Journ. Geol. Soc, May, 1879. 



1880. Davidson. On the Species of Brachiopoda that characterise the Gres Armoricain of Brittany 



and Normandy, together with a few Observations on the Budleigh-Salterton Pebbles — 

 Geol. Mag., new series, vol. vi, p. 338, pi. x, August, 1880. 

 1880. T. G. Bonney. Notes on the Pebbles in the Bunter Beds of Staffordshire — Geol. Mag., 

 decade ii, vol. vii, p. 404. 



