NOTES AND QUERIES. 



223 



some others discovered by hira in the same formation. This savant made known 

 at the same time the existence of a Chiton in the tertiary rocks of Italy. This 

 species, the knowledge of which is dne to the researches of M. Cantraine, 

 professor at the University of Ghent, will be described by him nnder the 

 name of C. mbappeninus, in the second part of his c " Malacologie Meditterraueene 

 et Littoralis," nnless it should be identical with that of the environs of Turin, 

 published in IS 47 by M. Michelotti, under the name of C. miocemcus. 



Before the publication of Baron Ryckholt's work, Mr. King had already 

 announced the presence of a Chiton found by M. Loft us in the Permian beds 

 of the environs of Sunderland, and described afterwards under the name of 

 C Loftusianus. On the other hand, M. Philippi had made known two other 

 species C siculus (Gray), and Cfasicularis (Linnaeus), from the tertiary forma- 

 tion of Sicily. 



To all these discoveries Mr. Salter, in 1846, added another, not the least 

 remarkable, that of a species of Chiton, in the inferior Silurian strata of Ireland. 

 This author proposed on this occasion a new genus under the name of 

 Helminthochiton, destined to receive solely the palaeozoic species ; but as the 

 proposed genus is not distinguished in any essential characteristics from the 

 ordinary genus Chiton, Prof, de Koninck considers it useless; and at most it 

 could only serve to designate a section from the last. 



In 1848, Mr. Searles Wood described and figured in his magnificent "Mono- 

 graph of the Mollusca of the English Crag," three species of fossil Chitons, of 

 of which one was new C. st rig ill at us ' ; and the other two identical to species now 

 living in our seas, C.fascicularis (Linn.), and C Rissoi (Payr). 



About the same time M. Eudes Deslongehamps, to whom science is indebted 

 for a great number of excellent works upon the J urassic fossils of the environs 

 of Caen, discovered in Bathonienne beds at Langrune the posterior or anal 

 plate of a species of Chiton, which he dedicated to M. de Koninck. This was 

 the first discovery of the genus in the secondary rocks. 



In 1852 M. Tergucm added another link to the chain, which bound the palae- 

 zoic Chitons to those of our own epoch, by the discovery of another new species, 

 C. Deshai/esii, in the middle lias of Thionville. 



Lastly, M. E. A. Roemer, described and figured in 1S55, a new species of 

 Chiton, C kevigatus, from the upper division of the Devonian formation of the 

 environs of Grund ; and figured another, without naming it, and for which De 

 Koninck has proposed that of C. tumid us. 



The following is a list of all the fossil Chitons known to this day, with the 

 geological formations and localities where they have been found. 



Upper Tertiary. 

 1. Chiton siculus, Gray. Sicily. 



2. fascicularis, Linn. Sicily, Sutton. 



3. Rissoi, Payrandcau. Sutton. 



4. strig Hiatus, Wood. Sutton. 



g ( miocenicus, Michellottti. Turin. 



\ sub-appenninus. Cantr? 



6. subcajetaniis, Poli (ex fide d'Orb.). Turin. 



7. transenna, Lea. Virginia. 



Lower Tertiary. 



8. antiquus, Conrad. Alabama. 



9. Grignoniensis, Lamk. Grignon. 



Great Oolite or Bathonian. 



10. Chiton Koninckii, Eudes Deslongch. Langrune. 



Lias. 



11. Chiton Deshaysji, Terquem. Thionville, Permian. (See appendix on 



the additional Permian species determined in 1858, by A. Kirkby.) 



