222 



THE GEOLOGIST. 



" north and south"— the same page read " Neligan's folly" In the list of fossils 

 read " Naticopsis PMllipsii" and " Lozomma " — G. R. Y. 



Errata in Hutton's Review oe Mr. Darwin's Theory. — Page 132, line 

 seven from bottom, for "rare" read "same" — p. 134, line 31, for "watched" 

 read " Matched" — p. 135, line 12 for "have" read " has"— also, line 14, for 

 " larger" read " longer" — p. 136, line 29, for " but in the Pampean mud" read 

 " but the Pampean mud" — P. W. H. 



Geology oe Clevedon — Sir, — Will you kindly answer the following ques- 

 tion through the medium of your valuable "Notes and Queries." _ 1. What 

 strata are developed at Clevedon, near Bristol. Especially can you inform me 



cham, Cheshire, in 1860, I found the fossil of which I enclose drawings — 

 What is it ? It was discovered in a ploughed field on what appeared to me 

 to be drift. 3. Are those echini found in gravel flint-casts of the interior ? — 

 J. C. C, Dedham. 



1. Clevedon Hill consists of Mountain-limestone, and some sandstone belong- 

 ing to the Coal-measures. See Mr. Trimmer's paper on the gravel lying on 

 Cleveland down, in the Journ. Geol. Soc, vol. ix., p. 282, &c, where a section 

 of the hill is given with much interesting information about the Drift-gravel 

 of its vicinity. 2. We cannot say what the specimen is from the figure sent to 

 us. 3. Yes. 



Two Species oe Chiton erom the Upper Silurian Beds oe Dudley. — 

 About two or three years since Prof, de Koninck figured and described these 

 fossils from the original specimens in the magnificent collection of Mr. J ohn 

 Gray, of Hagley. 



Before describing these species, he reviews the labours of palaeontologists with 

 respect to the genus to which they belong. 



The genus Chiton was established by Linnaeus in 1758, for a small number 

 of living species, and it remained for a long time unrepresented by any fossil 

 forms. 



It was not until 1802 that the first species of fossil Chiton was discovered 

 by Defrance, and described by Lamarck in the " Annales du Museum" (t. 11, 

 p. 309), under the name of Chiton Grignoniensis This specific name, derived 

 from a locality long famous for the abundance of its fossils, sufficiently proves that 

 species belong to the Calcaire grossier of Paris, that is to the middle beds 

 of the tertiary formation. 



In 1834, Mr. Conrad noticed a species, C. antiquus, from the tertiary rocks 

 of Alabama. 



About 1836 M. Puzos and the Count Duchastel discovered some remains of 

 Chiton in the Carboniferous limestone of the environs of Tournay. These re- 

 mains enabled Count Minister to establish a new species which he described 

 and figured in 1839, in the Beitrage-sur-Petrefaktenkunde (I. p. 58), under the 

 name of Chiton priscus. 



Towards the end of 1840 M. Guido Sandberger announced the probable 

 existence of the genus Chiton in the Devonian limestone of Willmar. InlS42 

 the same geologist described from it two new species, under the name of C 

 sirfjgraiiosm and C. fasciatus, in the list of Devonian fossils from that district.* 



One of these is probably identical with that which Mr. Fred. Roemer has con- 

 founded with Bellerophon expansus, of Sowerby, and which M. Sandberger 

 designated in 1845 as C. cardiformi$\ 



M. de Koninck described, in 1845, three new species of this genus from the 

 Carboniferous limestone of Belgium, to which, in 1845, Baron Ryckkolt added 



whether magnesian-limestone 



Ashley, Altrin- 



These speci fie names wore re-placed in 1855 by those of C. corrugatus and 

 ttaliSj without M. Sandberger making known the motive. 



