382 MR. H. BOLTON, F.E.s.E., ON [Feb., 1904. 



It is interesting to note that tlie same species occurs in 

 tlie "marine band" of the Middle Coal Measures, at Ashton 

 Moss Colliery, Audenshaw. The specimen from this locality 

 is— (L2620, e coll. Cairns, M.M.). 



Lingula mytiloides, or L. Credneri. 



It seems impossible to say which of these two species is 

 the one occurring so abundantly throughout the shales of the 

 Lower Coal Measures. 



The species is most common in the shales lying between 

 the Lower Mountain mine or G-annister and the top bed of 

 the Rough Rock. It is most easily found in the black 

 shales, both in the coal measures and in those of the millstone 

 grit series below. 



Lingula mytiloides or L. Credneri occurs in the lowest 

 shales of the Lower Coal Measures throughout Rossendale. 

 Examples are in the Dugdale Collection, M.M. 



Grreens Clough, near Portsmouth, in shales over the 

 Upper Rough Rock. E. coll. Dugdale, M.M. 



Carre Heys, Colne, over the Mountain Four Feet (W 505 

 e. coll. Wild, M.M.). 



Kersley Moor, horizon not known. M.M. 



Pimbo Lane (over Gannister). (Salter, Greol. Surv. Mem., 

 Geology of the Country around Oldham, p. 35). 



Lingula sp. Occurs in association with Posidonia (Posi- 

 doniella), over the Gannister coal at Billinge. (Hull Geol. 

 Surv. Mem., Geology of the Country around Wigan, p. 10). 



Eagley Shore Bridge, north of Bolton, below the Gan- 

 nister coal. (Op. cit., p. 34.) 



Pelecypoda. 

 Carhonicola (Anthracosia) rohiista. 

 This species is rare in the Lower Coal Measures. It is 

 recorded by Hull as follows : — ^Above the Gannister coal at 



