JN THE CARBONIFEROUS ROCKS OF THE EDINBURGH DISTRICT. 693 



Carboniferous Limestone Series. 



The lower limit of the Carboniferous Limestone Series is placed by Sir A. Geikie at 

 the Hurlet or Gilmerton Limestone, though purely marine beds also occur below this 

 horizon, as at Kinghorn in Fife, where the first and second " Abden " Limestones are 

 reckoned as still belonging to the Calciferous Sandstone series.* The late Mr John 

 Henderson t also noted two such limestones, containing hinged brachiopods and 

 crinoidal remains, at Stenhouse Mills in the Edinburgh district. 



To Mr Cadell of Grange I am indebted for the section (PL II.) of the strata of the 

 Carboniferous Limestone Series as developed at Gilmerton, Loanhead, and Niddrie, near 

 Edinburgh. This section shows the relative position to each other of the various lime- 

 stones, coals, and ironstones, and is specially useful for the purposes of this paper as 

 the pits of this neighbourhood have yielded the greater number of the fish-remains 

 collected from rocks of this series in the Edinburgh district. 



Lower Limestone Group. 



Marine Limestones. — Most of the fish-remains, all teeth and spines of marine 

 Elasmobranchs, which have occurred in these limestones are from the quarries on the 

 east side of the coal-field. The Museum collection is poor in these, but I have, as 

 already said, to thank the Director of the Geological Survey for permission to include 

 in my list a number of species which I have not seen except in the Scottish Survey 

 collection. No exact information is, however, available as to the precise beds in the 

 section from which they were derived — whether from the lowest limestone (No. 1, or 

 "Hurlet"), or from those above (Nos. 2 and 3, or "Hosies"); the appended localities 

 will, however, be so far useful. The list is meanwhile small, but may doubtless be 

 much increased by future collecting. 



Cladodus mirabilis, Ag., Mayfield. Copod us planus (Davis), Brunstane. 



„ striatus, Ag., Charlestown, Mayfield. Psammodus rugosus, Ag., Charlestown, Esperston. 



Petalodus acuminatus, Ag., Charlestown. Cochliodus contortus, Ag., Mayfield, Esperston. 



Ctenoptychius lobatus (R. Eth.), Charlestown. Xystrodus striatus (M'Coy), Mayfield. 



„ serratus (Ag.), Cousland. Pcecilodus Jonesii (M'Coy), Mayfield. 



Petalurhynchus psittacinus (M'Coy), Mayfield. Psephodus magnus (M'Coy), Middleton. 



Polyrhizodus magnus, M'Coy, Mayfield. Acondylacanthus Jenkinsoni (M'Coy), Mayfield. 



Pristodus falcatus, Davis, Charlestown. Harpacanthus fimbriatus (Stock), Gilmerton. 



It will be seen at a glance that not one of the above-quoted species occurs in any of 

 the lists which I have given from the Calciferous Sandstone Series of the district, while 

 all of them except Harpaeanthus fimbriatus are well known from the Mountain Lime- 

 stone of England, and, except Pristodus falcatus, of Ireland likewise. And that this 



* " The Geology of Central and Western Fife," Mem. Geol. Surv. Scotland, 1900, pp. 73, 74. 

 t Trans. Geol. Hoc. Edin., vol. iv. 1882, pp. 217, 218. 



