﻿144 



BRITISH FOSSIL CRUSTACEA. 











Breadth. 





Length. 



1st segment 



1 inch 7 lines and 





1 line. 



2nd 





1 „ 



8 



;? 





2 



lines 



3rd 



> ) 





1 „ 



9 



33 





3 



3) 



4th 



)? 





1 „ 



10 



33 





4 



,3 



5th 



> 





1 „ 



10 



33 





4 



33 



6th 



? 





1 „ 



10 



91 





5 



5) 



7th 



> 





1 ,. 



8 



37 





4 



33 



8th 



9 





1 „ 



5 



33 





5 



J J 



9th 



J • 





1 „ 



2 



33 





3 



13 



10th 



) * 





1 „ 







33 





4 



J? 



11th 



3 • 







10 



II 





5 



J) 



12th 



) • 







7 



J3 





8 



3) 



The telson measures at its widest 















(prox 



iminal) ei 



id 





4 



is 1 



inch 



7 



33 



Formation. — Uppermost Ludlow Rock, Upper Silurian. 

 Locality. — Lesmahagow, Lanarkshire. 



All the three specimens here figured are in the British Museum. 

 Museum of Practical Geology. 



The rest are in the 



Species 3.— EURYPTERUS PYGMvEUS :— Salter. PI. XXVIII, figs. 5, 6, 7. 



Eurypterus pygMjEUS, Salter, in Banks, 1856. Quart. Journ. Geol. Soc, vol. xii, 



p. 99, pi. ii, fig. 4. 

 — — Salter, 1859. Op. cit., vol. xv, p. 232, pi. x, figs. 4—8. 



In Mr. R. W. Banks's paper " On the Tilestones, or Downton Sandstones in the 

 Neighbourhood of Kington, and their Contents," read before the Geological Society of 

 London, December 5th, 1855, we find the first notice of this small Crustacean. The 

 remains appear to have been derived from the quarry at Bradnor Hill, near Kington, 

 between Bradnor Farm and the Quarry House. " The lowest fossiliferous bed exposed 

 in the lane is the equivalent of the Ludlow Bone-bed, a soft liver-coloured layer, 

 varying from two to three inches in thickness, and containing abundance of fossil remains, 

 Orthocerata, Goniop/iora, Orthonota, Orbicida, Holopella, Chonetes, Cornutites," &c. 

 " Above this layer, before the ' Tilestone ' is reached, layers of Orthonota amygdalina and 

 Troclms helicites, much flattened, occur. The uppermost beds are thin shaly beds of 

 Tilestone, containing a Lingula of a very small size (probably Lingula minima), grouped 



