ZOOLOOICAL AND BOTANICAL ASSOCIATION. 43 



from Tunstall and Humbleton Hijl, Durham. One of these he refers to 

 Chiton proper, under the name of Chiton (?) cordatus ; the remaining 

 three he refers to the genus Chitonellus, viz., C. Hancockianus, C. du- 

 tortu8, and C. antiquum. 



In a paper read before the Geological Society of Dublin, April, 1859,* 

 I made known the discovery of a Chiton of larger dimensions than any 

 previously met with, of which plates, belonging to several individuals, 

 were obtained by the fossil collector to the Geological Survey, Mr. C. 

 Galvan, and myself, from the carboniferous limestone of Lisbane and 

 Rathkeale, in the county of Limerick. This species I described by the 

 name of Chiton Thotnondiensis. 



Mr. Kirkby, in a note to his paper of March, 1859, and a further 

 communication with which he has favoured me, alludes to the additional, 

 and almost simultaneous, discovery of Chitons in the carboniferous lime- 

 stono of England. Mr. J. H. Burrow having collected an interesting 

 series of plates from the Lower Scar limestone of Settle, in Yorkshire, 

 these plates he believes to belong to several undescribed species, one of 

 which he has named C. Burrowianus. 



In September, 1 859, whilst attending the meeting of the British 

 Association at Aberdeen, I was shown, by Mr. Charles Moore, of Bath, 

 some loose plates of Chiton, with other very interesting fossils, obtained 

 by him from a Triassic deposit near Frome, Somersetshire. They have 

 not yet been described, but will add, at least, an additional species to the 

 doubtful one noticed by Dr. Geinitz as occurring in that formation. 



Having, therefore, now concluded this short account of the various 

 species of fossil Chiton, showing their occurrence through nearly all 

 the principal strata, the following list, in stratigraphical order, of all the 

 known species up to the present time, with their localities, will give then- 

 range in geological time. 



Class — Mollusca . 



Fam. — Chitonidae. 



Upper Tertiary. 



1. Chiton siculus {Or ay), Sicily. 



2. ,, fascicularis (Linnawi), Sicily; Sutton. 



3. „ Rissoi (Payrandeau). Sutton. 



* "Journal of the Geological Society of Dublin," vol. viii., part ii., p. 167; and 

 " Natural History Review," vol. vi., 1859, p. 330, Plate XXVIII. 



