Mr Etheridge on Adiantites Lindseaeformis in Limestone. 245 



From R. monensis it differs in the greater prominence, sharp- 

 ness, and extent of the longitudinal ridges on the scales, 

 which occupy nearly the whole of the exposed surface, whereas 

 in B. monensis these are not very prominently elevated, and 

 a considerable space is occupied by these delicate grooves, 

 which run parallel with the anterior and inferior margins. I 

 have much pleasure in dedicating this new and interesting 

 form to Mr Grossart of Salsburgh, Lanarkshire, to whom I am 

 indebted for the loan of the first specimen which came under 

 my notice. 



Geological Position and Locality. — Coal measures of Lanark- 

 shire. 



VI. Note on the Occurrence of Adiantites Lindseeeformis, Bun- 

 hury, in Strata connected ivith the Main Limestone at 

 Braidwood, Lanarkshire. By E. Etheeidge, Jun., 

 F.G.S., etc. 



The subject of the present note, Adiantites Lindseceformis^ 

 Bunbury, was originally described by the late Mr J. W. 

 Salter, from notes supplied by Sir Charles Bunbury, and pub- 

 lished in " The Geology of the Neighbourhood of Edinburgh." * 

 The type specimens were found by Mr E. Gibbs, collector to 

 the Survey, in the Lower Carboniferous shales (Calciferous 

 Sandstone) of Slateford, near Colinton, and the species is 

 exceedingly characteristic of that division of the Calciferous 

 Sandstone series, known as the Wardie Shale group ; indeed, 

 until a year or two ago it was thought to be exclusively re- 

 stricted to that horizon. However, in 1874, amongst a col- 

 lection of fossils, kindly lent to the Geological Survey by Mr 

 A. Patton, of East Kilbride, I recognised a specimen of a 

 variety of this species obtained by Mr Patton from a bed of 

 shale overlying the Calderwood cement stone, of the Lower 

 Carboniferous Limestone group, at the Kirktonholm Cement 

 Works, East Kilbride. About the same time Mr James 

 Bennie obtained a fragmentary specimen at another locality in 

 the same district, Burnbrae old quarry. I gave a short account 

 of these discoveries to the Botanical Society of Edinburgh in 



* Mem. Geological Survey Gt. Brit., No. 32, Scotland, 1861, p. 151. 



