Eiirypterid Eemams in Carhoniferoits Shales of Scotland. 501 



Eadstock, Somersetshire, where tlie head of the Eurypterid 

 lately described by Mr Peach was found. 



It will be most convenient to give these occurrences in 

 two groups, arranged according to the materials in which the 

 remains were found. 



First Group, in black fakes — (1.) Hailes Quarry, 4 miles 

 S. of Edinburgh ; (2.) Kingscavil Quarry, 1 mile E. of Lin- 

 lithgow ; (3.) Whinnyhall Old Quarry, 1 mile N.E. of Burnt- 

 island ; (4.) Gilmerton Sandstone Quarry, 4 miles S. of 

 Edinburgh ; (5.) Cove shore, 1 mile N.E. of Cockburnspath. 



Second Group, in fireclays or plant-beds — (1.) Joppa Quarry, 

 3 miles E. of Edinburgh ; (2.) Shear Burn, 3 miles S. of West 

 Calder; (3.) Shore West of the Pans, 1 mile E. of Crail, Eife. 



The positions of Nos. 1, 2, 3, and 5 are in the Calciferous 

 Sandstones, and No. 4 in the Carboniferous Limestone. In 

 the second group the position of No. 1 is in the Carboniferous 

 Limestone, and Nos. 2 and 3 in the Calciferous Sandstones. 



FiKST Group in Black Fakes. 



(1.) Hailes Quarry. — At page 104 of the paper on Spores 

 it is stated that a considerable number of pieces of scorpion 

 and Eurypterid skin had been found in the black fakes which 

 occur in the sandstone of Hailes quarry. Since the time 

 when that statement was made larger quantities of these 

 fakes have been examined and the results multiplied mani- 

 fold, and the conclusions confirmed with increased emphasis. 

 Throughout the whole time during which the 200 feet or so 

 of the sandstone of Hailes was being deposited, the winds 

 must have wafted and the streams have floated into the broad 

 shallow lake in which the sand was deposited all the light 

 vegetable and animal debris off the land that they could lift 

 aiid carry. This debris, after floating for a time, sank and 

 was buried in the sandbed as it fell, or as the waves disposed 

 it. This would be most frequently in small patches, which 

 now exist as black streaks in the solid layers of sandstone ; 

 less frequently in thin layers, which nov/ form the partings 

 by which the sandstone is divided into the shallow beds, 

 which is the most characteristic feature of the Hailes sand- 

 stone ; and sometimes into beds of black and white fakes, 



