92 M. L. de Koninck on two new Species of Chiton 



Chiton was discovered by Defrancc, and described by Lamarck* 

 under the name of Chiton grignoniensis, that name being derived 

 from a locality long celebrated for the great number of fossils 

 found there in deposits belonging to the Calcaire grossier of 

 Paris, that is to say, to the middle beds of the Tertiary formation. 



In 1834 M. Conrad made known a species (C. antiquus) from 

 the Tertiary formation of Alabamaf. 



In 1836 M. Puzos and M. le Comte DuchastelJ found some 

 remains of Chiton in the Carboniferous formation of the environs 

 of Tournay ; these fragments enabled Count Minister to establish 

 a new species, which he described and figured in 1 859 § under the 

 name of Chiton priscus. 



This discovery was considered of some importance by palaeon- 

 tologists, who were far from expecting to find species of this 

 kind in palaeozoic strata ; nevertheless, in the latter part of the 

 year 1840, M. Guido Sandberger announced the probable exist- 

 ence of the genus Chiton in the Devonian limestone of Villmar ||. 

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

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

 then published of Devonian fossils from the same locality^; one of 

 these species is probably identical with that which M. F. lloemcr 

 has mistaken for Better ophon expansus, Sow.**, and which was 

 named C. cordiformis by M. Sandberger in 1845. 



In 1843 I described three new species of Chitonff, procured 

 from the Carboniferous formation of Belgium, to which in 

 1845 M. le Baron de Byckholt added some others discovered by 

 himself in the same formation J J. That savant made known at 

 the same time the existence of a Chiton from the Tertiary forma- 

 tion of Italy — a species we owe to the researches of M. Can- 

 traine, Professor in the University of Ghent ; it is described 

 by him under the name of C. subapenninus in the second part of 

 the 'Malacologie Mediterraneenne etLittorale/ It may, however, 

 prove identical with that from near Turin, published in 1847 by 

 M. Michelotti under the name of C. miocenicus §§. 



* Annales du Museum, t. ii. p. 309. 



t Morton, Syn. of Organic remains, Appendix, p. 6. 



X This species is published by M. Desbayes in the new edition of the 

 ' Histoire nat. des Anirn. s. Vertebres ' of Lamarck, t. vii. p. 490. 



§ Beitrage zur Petrefaktenkunde, i. p. 38. 



|| Neues Jahrb. fur Mineral, mid Geol. 1841, p. 240. 



% Ibid. 1842, p. 399. These names were replaced in 1853 by those of 

 C. corrugatus and sagittalis, without M. Sandberger having given a reason 

 for so doing (G. & F. Sandberger, 'Die Versteiner. des Rhein. Schichtens. 

 in Nassau,' pp. 238, 239). 



** Neues Jahrb. fur Mineral, und Geol. 1845, p. 439. 



ft Descript. des anim. fossiles du terr. carb. pp. 322, etc. 



X% Bulletins de l'Academ. de Belg. t. xii. 2 me partie, pp. 45, etc. 



§§ Descript. des foss. du terr. mioc. de l'ltalie, p. 132, pi. 16. f. 7. 



