ZOOLOGICAL AND BOTANICAL ASSOCIATION. 41 



With this abstract I have incorporated additional information respecting 

 species discovered since the publication of M. De Koninck's paper. 



The first species of fossil Chiton was discovered in 1802, by De- 

 france, and described by Lamarck under the name of Chiton Grignonensis, 

 that name being derived from a locality celebrated for the great number 

 of fossils found there ; the strata in which it occurred belonging to the 

 " Calcaire grossier" of Paris, or middle division of the tertiary forma- 

 tion. 



In 1834, Mr. Conrad made known a species (Chiton antiquus), from 

 the tertiary formation of Alabama, United States. 



In 1 836, M. Puzos, and M. le Comte Duchastel found some remains 

 of Chiton in the carboniferous formation near Tournay ; these fragments 

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

 and figured in 1839, under the name of Chiton prisms. This discovery 

 was considered to be of some importance by palaeontologists, who did not 

 expect to find species of Chiton in palaeozoic strata ; however, in the 

 latter part of the year 1840, M. Quido Sandberger announced the pro- 

 bable existence of the genus Chiton in the Devonian formation of Vill- 

 mar. In 1842, the same geologist added two new species, under the 

 namea of C. subgranosus, and C. fasciatus, to the list, which he then 

 published, of Devonian fossils from the same locality ; one of these spe- 

 cies is probably identical with that which M. F. Eoemer has mistaken 

 for Bellerophon expansus., Sowerby, and which was named Chiton cordi- 

 formis by M. Sandberger in 1845. 



Prof. De Koninck himself described, in 1843, three new species of 

 this genus procured from the carboniferous formation of Belgium, to 

 which, in 1845, M. le Baron de Byckholt added some others he disco- 

 vered in the same formation ; at the same time time, making known the 

 existence of a Chiton from the tertiary formation of Italy, described by 

 M. Cantraine underline name of C. subappeninus } — a species which may, 

 however, prove to be indentical with that from near Turin, published in 

 1847 by M. Michelotti, under the name of C. miocenicus. 



In 1844, and before the publication of the work of M. de Byckholt, 

 Mr. King announced the occurrence of a Chiton found by Mr. Loftus in 

 the Permian formation at Tunstall Hill, Durham. This species he de- 

 scribed in 1849, and named C. Loftusianus. 



Previous to this date, M. Philippi made known the occurrence of two 



ZOOL. * PBOC. 80C — VOL. II. O 



