1862.] KIEKBY FOSSIL CHITONS. 233 



1. On some Remaim of Chiton from the Mountain -limestone of 

 YoKKSHiRE. By James W. Kiee:by, Esq. 



[Communicated by Thomas Davidson, Esq., F.E.S., F.Gr.S.] 



The remains of Chiton noticed in the present paper were sent to me 

 for examination about two years ago by Mr. H. J. Burrow, of Settle, 

 with permission to describe them should it appear to me desirable 

 to do so. Not being able to identify any of them with species 

 already described, I agi'eed to draw up a short account of them, so 

 as to make their discovery known. My delay in doing this is mainly 

 due to an expectation of the discovery of additional materials ; but 

 as this expectation has not been realized, it will be well, perhaps, 

 not to withhold their description any longer ; for though the plates 

 already known may probably give but a very imperfect idea of the 

 species to which they belong, they certainly seem of sufficient im- 

 portance to allow of their being brought before the attention of palae- 

 ontologists. 



There are eight plates in the collection, four of which are posterior 

 plates, and the others intermediate ; and, notwithstanding the small- 

 ness of their number, they appear to belong to four species. That 

 so many species should be represented by so small a number of plates, 

 all from one locality, seems, I must confess, somewhat remarkable ; 

 but the differences of the characters of the plates are such as to 

 render it scarcely possible for them to belong to less than the number 

 of species named. 



The specimens were found in the Lower Scar Limestone, in the 

 vicinity of Settle, and apparently near the base of that subdivision 

 of the Mountain-limestone of Yorkshire; but I here rely solely 

 upon the observation of Mr. Burrow, whom it may be well to quote. 

 He states, " The exact position of the bed in which the Chitons 

 occur is rather difficult to determine, though it certainly belongs to 

 the Lower Scar Limestone of Phillips. So far as I can judge, the 

 bed is nearer the bottom than the top of the Lower Scar Limestone ; 

 but, from the bed only occurring in one place, and then where the 

 strata have been disturbed, I hardly dare venture to make a guess 

 at the thickness of the limestone above it. The place where the 

 bed crops out is on the very edge of the Craven fault, by which, not 

 a hundred yards from the spot, the Millstone-grit is thrown down 

 to a level with the Lower Scar Limestone. The only place where 

 the specimens occur is a field within a hundred yards of a very 

 beautiful little waterfall, called Scaleber Foss." 



" The matrix is a dark, hard limestone, and abounds in fossils. 

 Among others are Orthoceras Goldfussianum, De Kon., 0. Muensteria- 

 num, DeKon., Cyrtoceras Uoiguis?, DeKon., an abundance of beau- 

 tifully preserved Goniatites striatus, var. crenistria, Phillips, and 

 several other species of Goniatites, Orthoceras, and Nautilus; also 

 Patella {mhricata,Si Buccinum, Cypricardia trapezoidalis, De Kon., a 

 large Pecten, and other Conchifera, some in great abundance. The 

 principal Brachiopods are Rhynchonella angulata, Terehratula hastata, 

 and Spirifera cuspidata.'"' 



