New Earij2)tcrid from U'pper Coctl-7neasiires of Radstock. 441 



is more coarsely sculptured than the depression out of 

 which it rises. The sculpturing is continued up to the edge 

 of the faceted cornea of the compound eyes. The other 

 oblique grooves are also finely sculptured. Near the lateral 

 margin, a little in advance of the grooves, the squames are 

 highly elongated and imbricating, so as to resemble the 

 feathers of a bird's wing. 



Near the anterior and antero-lateral margins the squames 

 become less and less convex, and run together so as to form 

 sinuous lines, which interosculate with each other, and bend 

 round gradually as they approach the lateral margins, so as 

 to impinge upon them at very acute angles. As the inter- 

 mediate spaces between the lines are pitted and punctate, 

 the whole ornamentation in such places is almost identical 

 with that which occurs in a similar situation, and is charac- 

 teristic of the family of Asaphidse, among the trilobites. 

 The flange, or that portion of the carapace which is bent 

 inwards to form the under surface, is also sculptured. Be- 

 tween the margin and the fold above mentioned the squames 

 are minute and pointed, and sparsely set. Within this 

 they are large, and run together to form inosculating sinuous 

 lines. Perhaps the most curious feature of the case is, that 

 while the convexity of the squames on the dorsal surface is 

 always directed backwards, on these flanges the opposite is 

 the case, for they point outwards and forwards, as if the 

 flange were in reality a portion of the carapace, which had 

 not long in the life history of the Eurypterids been folded 

 over from the dorsal to the ventral side. This seems to 

 liave an important bearing upon the position of the lateral 

 eyes in the different genera of the family. Those having 

 the eyes marginal may be considered as having this folding 

 over carried to a greater extent than those in which the 

 eyes still remain upon the dorsal surface. 



In the Geological Magazine for November 1887, Dr Henry 

 Woodward has described a Lower Carboniferous Eurypterid, 

 from Langholm, Dumfriesshire, under the name of Eurypterus 

 scahrosus} It is evident from the form, that the above- 

 described carapace belonged to a species nearly allied to it. 



1 Geol. Mag., Dec. 3, vol. \x., No, 11, pp. 481-484. 



