248 ON THE PERMIAN CHITONID^. 



plates at Humbleton Hill, Hylton Castle, and at the New 

 Poorlioiise, Bishopwearmouth ; and Mr. Howse gives Claxheugh, 

 Ryliope, Silksworth, and Southwick Red House,* all of which, 

 as well as those previously named, are localities of the shell- 

 limestone. 



Prof. King states that he found two intermediate plates of a 

 Chiton in some Permian limestone from Kirkby Woodhouse, 

 Notts ;f and I met with a posterior plate in a Permian deposit at 

 Brodsworth, and an intermediate plate at Moorhouse Quarries 

 in the South of Yorkshire, all of which may belong to this 

 species. 



As C. Lqftusianufs is, comparatively speaking, not a recently 

 discovered species, having been found some fifteen years ago, it 

 has, of course, been the subject of repeated observations by writers 

 on Permian palaeontology. 



Its discovery in 1844 at Tunstall Hill by Messrs Loftus and 

 King has already been mentioned ; and its discovery was noticed 

 by the latter in the same year. J In 1846, Prof. King gave a 

 provisional description of it, with illustrations of an intermediate 

 plate.§ It was mentioned in 1848 by Mr. R. Howse in his 

 " Catalogue of Permian Fossils" (p. 24), and in the same year by 

 Prof. King in his " Catalogue of Permian Organic Remains" 

 (p. 12), where it was first named Loftusianus. In 1850 it was 

 more fully described and figured by Prof. King in his " Mono- 

 graph of Permian Fossils" (p. 202). Finally, it was redescribed 

 by Mr. Howse in 1857 in his " Notes on Permian Fossils."|| 



2. C. HowsEANUS, Kirkby. PI. XIIL, figs. 42-53. Kirkby, 



Quart. Journ. Geol. Soc, 1857, vol. xiii., p. 216, pl. 



7, figs. 9-13. 



General outline elongately subrectangular ; surface of plates 



granulated. Anterior plate semicircular; posterior margin re- 



enteringly angulate ; apex elevated. Intermediate plates compara- 



* Ann. & Mag. Nat. Hist., 2 ser., vol. xix., p. 42 (Synoptical Table). 



t Mon. Perm. Foss.,p. 203. 



t Ann. & Mag. Nat. Hist., 1 ser., vol. xiv., p. 382. 



§ Charleswortli's London Geol. Jour., vol. i., p. 10. 



II Ann. & Mag. Nat. Hist., 2 ser., vol. xix., p. 463. 



