222 
THE GEOLOGIST. 
" north and souW — the same page read " Neligan's folly P In tlie list of fossils 
read " Naticopm Phillipsii" and Loxonema."—G. K. V. 
Errata in Hutton's Review of Mr. Darwin's Theory. — Page 132, line 
seven from bottom, for "rare" read "same" — p. 134, line 31, for "watched" 
rea.^ " matcJied" — p. 135, line 12 for "have" read " Z/^/^"— also, line 11, for 
"larger" read "longer" — p. 136, line 29, for "but in the Pampean mud" read 
"but the Pampean mml"—F. W. H. 
Geology of Clevedon — Sir, — ^Will you kindly answer the following ques- 
tion through the medium of your valuable " Kotes and Queries." 1. What 
strata are developed at Clevedon, near Bristol. Especially can you inform me 
whether magnesian-limestone is one of them. 2. Whilst at Ashley, Altrin- 
chaDi, Clieshire, in 1S60, I found the fossil of which I enclose di'awings — 
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 do^vn, in the Journ. Geol. Soc, vol. ix., p. 2S2, &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 or Chiton fro^i the Upper Silurian Beds of 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. John 
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 Linnzeus 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 Grignouiensis This specific name, derived 
from a locality long famous for the abundance of its fossils, sufliciently proves that 
species belong to the Calcaii'e grossier of Paris, that is to the middle beds 
of the tertiary formation. 
In 1831, Mr. Conrad noticed a species, C. antirpius, 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 Miinster to establish a new species which he described 
and figured in 1839, in the Beitrage-sur-Petrefaktenlvunde (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 WiUmar. In 1842 
the same geologist described from it two new species, under the name of C, 
S2ihgranosi'.s and C. fascial us, in the list of Devonian fossils from that district.* 
One of these is probably identical with that whicli Mr. Fred. Iloemer has con- 
founded with BeUerophon expansus, of Sowerby, and which M. Sandberger 
designated in 1845 as C. cardiformis. 
M. de Koninck described, in 1845, three new species of this genus from the 
Carboniferous limestone of Belgium, to which, in 1845, Baron Ilyckholt added 
* These specific names were re-placed in 1855 by those of C. comigatus and 
C. sagittalis, without M. Sandberger making known the motive. 
