EURYPTERUS BREWSTERI. 151 



Formation. — Upper Old Red Sandstone. 

 Locality. — Kiltorcan, Co. Kilkenny, Ireland. 



The specimens are preserved in the Museum of the Geological Survey of Ireland, 

 Hume Street, Dublin. 



Species 8.— EURYPTERUS BREWSTERI :— H. Woodward. PI. XXVIII, fig. 4. 



Eurypterus Brewsteri, H. Woodward. Brit. Assoc. Report, Section C, Bath, 1864, 



p. 73. 

 — — H. Woodward. Geol. Mag., 1864, vol. i, p. 200, pi. x, 



fig. 3. 



This species of Eurypterus was obtained by the Rev. Henry Brewster, of Farnell, 

 near Brechin, from the Old Red Sandstone of Kelly Den, near Arbroath, and its specific 

 name was suggested in honour of its discoverer by Mr. Powrie in 1864, through whom I 

 obtained the loan of the specimen for description. 



It consists of a carapace and a portion of the first thoracic segment, slightly displaced ; 

 close to which is seen an ovisac, in which are more than twenty ova, more or less 

 compressed. 



The carapace measures 2 inches 2 lines in breadth at its posterior border, and 7 lines 

 in length. The sides curve rapidly inwards, leaving the front border only 8 lines 

 broad. The eyes, which are one line in length, are reniform, and within the anterior half 

 of the carapace ; they are four lines apart, and have their convex surfaces directed out- 

 wards. The margin of the carapace is slightly striated, and there is an inner elevated 

 border in front, 1 line in breadth, which thins out and disappears on the lateral border. 

 The surface of the carapace is slightly wrinkled, but not ornamented in any way. 



This species agrees most nearly in general form with Eurypterus lacustris of Harlan 1 

 from the Upper Silurian of New York, but the relative proportions differ considerably. 



Interesting as this carapace is, it is rendered still more so by the ovisac associated with 

 it. The so-called Parka decipiens of Fleming may include many widely different 

 organisms, but I fully believe that the oviform bodies from the Old Red Sandstone are 

 chiefly the eggs of Crustacea belonging to the order Merostomata. 



Formation. — Old Red Sandstone. 



Locality. — Kelly Den, near Arbroath, from the Museum of James Powrie, Esq., 

 F.G.S., Reswallie. 



1 See Hall's 'Palaeontology of New York,' p. 407, pi. lxxxi, fig. 3. 



