144 



BRITISH FOSSIL CRUSTACEA. 













Breadth. 





Length. 



1st segment 



1 inch 7 lines ar 



id 



1 line. 



2nd 



>> 





. 1 



5> 



8 





2 lines. 



3rd 



j> 





. 1 



)> 



9 





3 



)) 



4th 



>> 





. 1 



>> 



10 





4 



»> 



5th 



>> 





. 1 



}) 



10 





4 



>> 



6th 



>> • 





. 1 



1) 



10 





5 



>> 



7th 



>> 





1 



>f 



8 





4 



>> 



8th 



>> 





1 



5> 



5 





5 



>> 



9th 



a 





1 



>y 



2 





3 



95 



10th 



}> ■ 





1 



j> 









4 



J> 



11th 



>} 









10 





5 



>> 



12th 



>> 









7 





8 



>> 



The telson measures at its widest 















(F 



•oximinal) ei 



id 







4 



is 



1 inch 7 



>> 



Formation. — Uppermost Ludlow Rock, Upper Silurian. 

 Locality. — Lesmahagow, Lanarkshire. 



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

 Museum of Practical Geology. 



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



Eurypterus PYGMiEUS, 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, Goniophora, Orthonota, Orbicula, Holopella, Chonetes, Cornulites" &c. 

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

 Trochus 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 



