86 Proceedings of the Royal Physical Society. 



sp.. Gasteropoda 10 sp., Cephalopoda 3 sp.* In the Bo'ness 

 Coalfield a similar marine band occurs, forming the roof of 

 the Smithy Coal; here have been met with two Brachio- 

 pods, seven Bivalves, and two Gasteropods.-f The fauna of 

 the remaining portion of this group is purely fresh water or 

 estuarine, whilst the shale above the Bo'ness Lower Ironstone 

 is crowded with an Anthracoptera, a true Coal Measure 

 genus properly speaking.| We find in this fact an entire 

 departure from the condition of things in the Fossil Series, 

 where there appears to be a singular absence, says Mr 

 Young, of the characteristic bivalves of the Coal Measures.§ 



In the slaty band Ironstone of Gilmerton and Loanhead in 

 the Edinburgh field, according to the researches of Mr Som- 

 mervail, Lingida sqiiar/dformis occurs to the exclusion of 

 other forms,! I but this does not hold good of any of the beds 

 in the Bo'ness Coalfield, collected from by Mr James Bennie. 



From the fossiliferous Upper Limestone Group we pass to 

 the comparatively unfossiliferous Millstone Grit, previous to 

 again advancing to a more richly provided series, the Coal 

 Measures. 



In Fife, the late Mr R Gibbs found fossils in the Millstone 

 Grit as early as 1860,11 viz.. Prod, semireticulatus, Lingula 

 mytiloides, a Modiola, and a Macrocheilus, etc. 



Again, the Curly Ironstones of the Wishaw district, at the 

 base of the Millstone Grit, have been found to contain four 

 Brachiopods — Lingula mytiloides, L. squaniiformis, Orthis 

 resupinata, and StreptorhyncJius crc7iistria.** At about a 

 similar horizon, in the neighbourhood of Douglas, near Les- 

 mahagow, shales and ironstones are met with, containing more 

 than one species of Anthracosia. ff In the Gladsmuir Hills 

 the shales under the Curly Ironstones contain Piscina nitida, 

 Orthis, sp., Streytorhynchus crenistria, a Schizodiis, and Bellcro- 

 fhon decussatus.\\ 



Mr W. Grossart describes another horizon in this division 



* Young, loc. cit., pp. 309, 310. 



t Mem. Geol. Survey, Scotl, No. 31, p. 70. X Ibid., p. 69. 



§ Loc. cit., pp. 307, 308. || Trans. Geol. See, Edinb., 1877, iii., p. 72. 



t Mem. Geol. Survey, Scotl, No. 32, p. 150. ** Ibid., No. 23, p. 89. 



i\ Loc. cit. tX Mem. Geol. Survey, Scotl., No. 31, p. 74. 



