ETHERIDGE DEVONIAN ROCKS AND FOSSILS. 577 



eluding the ' Silurian System ') of this elaborate work, descriptive of 

 the Silurian deposits of the world, embraces much information, if 

 not the most complete resume known of the Devonian and Old Eed 

 Sandstone systems, leaving, for the purposes of generalization, little 

 to be done. Pp. 269 to 292 are descriptive of the Old Red Sandstone 

 of England, Wales, and Scotland ; they are succeeded at p. 292 by a 

 masterly description of the Devonian Eocks in Devon and Cornwall, 

 and Ireland ; pp. 405 to 410 are devoted to the Devonian rocks of 

 Saxony &c., and pp. 417 to 471, inclusive, to those of the Ehenish Pro- 

 vinces, Belgium, Erance, America, and Spain. The literature of the 

 Devonian question is here nearly exhausted. 



1860. Pengelly. — " On the Chronological and Geographical Dis- 

 tribution of the Devonian Fossils of Devon and Cornwall " *. Im- 

 portant tables accompany this paper, as well as a resume of the views 

 held by earlier authors ; and Mr. Pengelly in the latter part of his 

 communication discusses the relations existing between the Silu- 

 rian and Devonian, and between the Devonian and Carboniferous 

 species. 



1861. Pengelly.— ''On the Devonian Age of the World "f, the 

 substance of six lectures delivered at the Eoyal Institution, in which 

 much valuable matter is brought together relative to the whole 

 Devonian question. The distribution of groups and species is de- 

 tailed, &c. J, and elaborated into a commentary upon their peculiari- 

 ties, forming a digest of the subject. 



1862. Pengelly. — " On the Geological and Chronological Distri- 

 bution of the Devonian Fossils of Devon and Cornwall " §. This is 

 a more detailed account of the distribution of the Devonian fossils 

 than that given in the ' Brit. Assoc. Eeport,' Oxford, 1860 ; numerous 

 tables, showing relative and absolute distribution, and the value of 

 the several species, as well as calculated deductions, and data for 

 future labours yet, upon the Devonian fauna of Devon and Cornwall. 

 These two papers should be consulted by all students of Devonian 

 geology. 



1863. Salter, J, W.—" On the Upper Old Eed Sandstone and 

 Upper Devonian Eocks " ||. — An important communication upon the 

 Upper Old Eed Sandstone and Upper Devonian beds, in which the 

 author clearly establishes the value of this division. He describes 

 the South Pembrokeshire Old Eed Sandstone generally, especially 

 those- beds at Drinkim Bay in Caldy Island, where it is shown, 

 as in the Avon section at Bristol, that the Old Eed is defi- 

 nitely distinct from the overlying Lower Limestone Shales in every 

 particular, especially so in the total absence of fossils. The author, 

 however, notices a bed of Serpulce some fifty feet down in the Old 

 Eed Sandstone, which perhaps is the only marine form known in this 



* Brit. Assoc. Eeport, 1860. 



t Six Lectures delivei-ed at the Eoyal Institution, in May and Juiie 1861, 



\ Published in the ' Geologist,' vol. iv. p. 332. 



§ Geologist, vol. v. p. 10; and Brit. Assoc. Eeport, Oxford, 1860; also Roval 

 Geol. Soc. Cornwall, Report 1860. p. 388. Earlier notice. 



II Quart. Jonrn. Geol. Soc. vol. xix. 1803. 

 VOL. XXTII. PART I. 2 R 



