124 BRITISH FOSSIL CRUSTACEA. 



Species 2.— STYLONURUS MEGALOPS :— Salter, sp. 1859. PL XXI, 



fig. 3, 3 a. 



Eurypterus megalops, Salter. Quart. Journ. Geo!. Soc, 1859, vol. xv, p. 233, pi. x, 



figs. 9 and 10 {not figs. 11 — 14, which are referable to 

 another species). 



Stylonurus — H. Woodw. Op. cit., 1865, vol. xxi, p. 486. 



In a communication made by me to the Geological Society of London in June, 1865, 

 I stated that, from an examination of Eurypterus megalops, Salter, from Ludlow, I was 

 led to conclude that this was also a " 8tylo7iurus!' x 



Under this name Mr. Salter had associated several detached body-segments, which, 

 however, presented no character by which they might definitely be placed with the 

 head-shield, upon which my conclusion was based. 



"The head (writes Mr. Salter) in the largest specimens known is \\ inch wide (and 

 this would give fully the length here assigned to the body [namely, 7 or 8 inches long] ; 

 it is wider than long, semicircular, granuloso-plicate, and with the hinder margin 

 tuberculate. 



" The great reniform eyes are nearly one third as long as the head, and (including 

 the swollen base on which they are set, and the large circular eye-lobe which covers 

 them) fully one third, measured from within the eye-lobes ; they are about their own 

 diameter apart, and placed much more than half-way, but not quite two thirds, up the 

 head. The anterior margin of the head (carapace) is rounded, or very slightly angular, 

 and margined all round the front." 



Locality. — Base of Old Red Sandstone, Ludlow Railway. 



Species 3.— STYLONURUS SYMONDSI1 :— Salter, sp. 1857. PL XXI, fig. 4. 



Eurypterus Symondsii, Salter. Edin. New Phil. Journ., new series, 1857, vol. vi, 



p. 257. 



— — Salter. In Murchison's Siluria, 3rd edition, 1859, p. 274, 



woodcut, Fossils (68). 



— — Salter. Quart. Journ. Geol. Soc, 1859, vol. xv, p. 230, 



pi. x, fig. 1. 

 Stylonurus — H. Woodw. Quart. Journ. Geol. Soc, 1865, vol. xxi, p. 4S6, 



pi. xiii, fig. 4. 



— — Murchison's Siluria, 4th edition, 1867, p. 246, Fossils (69). 



This very curious form, which was described by Mr. Salter, in 1859, 2 under the name 



1 « Quart. Journ. Geol. Soc,' 1865, vol. xxi, p. 486. 



2 Id., 1859, vol. xv, p. 230. 



