208 Tin-: PERMIAN FORMATION. 



as uv i . the conditions were probably less favourable to exis- 



tence. Verj Few, indeed, of the forms of life met with in the Lower 

 Limestone survived into I tie Middle Limestone (or small-grained Dolo 



' Yorkshire. Indeed, after the deposition of the Lower Lime- 

 Btone, (proper,) and during that of the small-grained Dolomite, it 

 would appear as if there had been a total withdrawal of species from 

 the South Yorkshire area. During the same epoch, however, (if the 



;:eii of these rocks by Mr. Kirkby (a) may be considered as 

 the fauna reached its maximum development in the 

 Shelly Limestone of Durham. Prior to the commencement of the 

 I ' imp.!- Limeston stage, the exodus of the marine fauna throughout the 

 whole Permian area of the North-east of England was most pronounced, 

 only two species of mollusca coming back in the Upper Limestone of 

 Yorkshire, both now excessively dwarfed, shewing the severity of the 

 Btruggle they had gone through (b), and ouly three or four species 

 being found in the Upper Limestone of Notts and Durham. 



It thus appears that the waters of the saline lagoons in which the 

 Permian rocks of the North-east of England were formed, which had 

 fora time become connected with the open sea, after this connection 

 had been put an end to, became more and more saturated with mineral 

 salts as time rolled on, and less and less fitted for the habitation of 

 li\ ing beings. 



These living forms in the first place entered the area slowly, their 

 retreat having been a little later on cut off by closure of the outlet: 

 they were driven hither and thither, according as the physical conditions 

 of existence became locally more or less incapable of supporting animal 

 life. In the end. (unless successful in withdrawing themselves through 



lorarily reopened outlet,) they must have been entirely exter- 

 minated by the finally unendurable salinity of the waters. 



THE FLORA OF WARWICKSHIRE. 



AN ACCOUNT OF THE FLOWER1NC PLANTS AND FERNS 



OF THE COUNTY OF WARWICK. 



BY JAMES E. BAGNALL. 



i Continued from page 196. 1 



DROSERACE^E. 

 DROSERA. 

 D. rotundifolia, Linn. Sundew. 



Native: [n marshes and bogs. Very rare. July, August. 

 I. Birmingham Heath, With., ii., 405 ; Coleshill Heath! Brer, Mag. 

 Nat. His., iii., L65 ; Sutton Parkl Freeman, Phyt., i., 262. 

 il> abundant in Sutton Park, but now very rare ; Coles- 

 liili Pool and bog; bog mar Little Packington. 



en I,.,, 



i'ii According to Kirkby, Axinut dubius, while fullj twoinchei wide in the 

 i. i if Yorkshire, is not half an inch in width in the Brothertou 



i. •it. 



