8 Proceedings of the Boycd Physical Society. 



but high sounding names of these ancient " bncldes." In a 

 collection made by Professor James Nicol, and noticed in 

 his paper " On the Geology of the Silurian Eocks in the 

 valley of the Tweed/'* Mr Salter detected six species of 

 shells, irrespective of other organisms from that locality, -f 

 viz. : — 



Leptiena tenuistriata, Shy. 



Orbicula, sp. 



Orthis calli£(ramma, Dalman. 



Orthis (large sp.). 



Spirifera biforata, Schlotheim, var. 



Lituites cornuarietis, Shy. 

 Such are some of the "cockles" from Sir James Plall's 

 " Alpine limestone," a bed, Professor Mcol tells us, 30 feet 

 in thickness, and now known as the Wrae limestone. 



Many years after, this list was enlarged by the addition 

 of two other shells — Orthis actonice, and Orthoceras ihex 

 (Salter). + 



Salter's investigations were continued in the next year, as 

 we learn from the title of a short paper, " ISTote on the Fossils 

 from the Stinchar Eiver, and the Slates of Loch Pyan," § 

 appended to a communication by Mr J. Carrick Moore, " On 

 some Fossiliferous Beds in the Silurian Eocks of Wigtown- 

 shire and Ayrshire," who discovered the fossils. The red 

 slate of Loch Eyan yielded a single univalve, the Euomphalus 

 furcatus (M'Coy), accompanied by Graptolites. The Stinchar 

 bed, a limestone, probably identical with that at Wrae quarry, 

 and like it about 30 feet in thickness, yielded six species of 

 Gasteropoda and one Brachiopod. Salter remarked, how- 

 ever, that at Wrae the latter are the characteristic fossils, 

 whilst in the Stinchar limestone the spiral shells are the 

 commonest. 



In 1851 appeared the most important contributions to 

 Scotch Silurian Palseontology published up to that date — a 



* Quart. Jour. Gcol. Soc, 1848, v., pp. 195-209. 



i "Notice of the fossils collected by Mr Nicol in Peeblesshire " {Ibid., 1818, 

 v., pp. 205, 206). 

 X Mem. Gcol. Survey, Scotl., 1869, Expl. xxiv., p. 8. 

 § Quart. Jour. Gcol. Soc, 1849, v., p. 13. 



