NELSON AND TAYLOR : ON YORKSHIRE MOLLUSCA. 5 



District; on the East by the rail from Ha3'ton to Market Weighton, 

 and thence by the East bank of the INIarket V/eighton Canal; and 

 on the West by the Roman road from Micklefield to Castleford, 

 thence road through Houghton to Pontefract, rail to Snaith, and 

 thence to Adlingfleet. 



5. Hatfield and Thorne. — Adlingfleet to Snaith- -thence 

 South bank of Don to Doncaster, and rail to Bav/try. 



6. Trent. — Rail from Bawtry to Doncaster, thence South 

 bank of Don to Sheftield and rail southward to county boundary. 



7. Went Va!e. — Rail from Pontefract to Snaith, thence 

 South bank of Don to Doncaster, road to Hickleton, water-shed 

 line to Crofton Station and rail to Pontefract. 



8. Dearne. — ""Went Vale" boundary from Doncaster to 

 Crofton, thence water-shed line by Ryhill and Notion to Stain- 

 cross, along Woolley Edge to Midgley, through Denby Grange to 

 Shelley and Denby Dale Station, thence by rail nearly to the 

 Don, water shed to Wortley and through Wortley Park to West- 

 wood Station, thence to Rotherham, and South bank of Don to 

 Doncaster. 



9. Don. — Rail northwards from the county boundary to 

 Sheffield, thence South bank of Don to Rotherham, " Dearne " 

 boundary to Shelley and along the water-shed line to the county 

 boundary at Ramsden Edge. 



10. Col ne.— County boundary from Ramsden Edge to 

 Cumberworth, Shelley and Kirkburton, thence to Cooper Bridge 

 Station, thence water-shed line westward to the county boundary 

 on Blackstone Edge. 



!l.. Upper Calder. — Bounded on the South by the 

 "Colne"' district, thence rail from Cooper Bridge Station past 

 Mirfield and Heckmondwike to Low Moor and Bierley, thence 

 water-shed line to county boundary on Haworth Moor. 



12. Lower Calder. — Rail from Crofton to Pontefract, 

 thence road to Houghton and Castleford, rail by Stanley and 

 Ardsley to Tong, thence to Bierley, and rail by Heckmondwike to 



