34 Prof. T. R. Jones and Mr. J. W. Kirkby on 



Lochgelley Colliery, Fife, in blackband, with Spirorbis sp., 

 Lepidostrobus, and other plant-remains. 



On the Fife coast, near Kilrenny Mill, Anstruther, in iron- 

 stone, about 3500 feet below the Carboniferous Limestone, 

 associated with Carbonia Rankiniana, Leperditia scotobur- 

 digalensis, a thin-shelled Mi/alina, and Ganoid scales. 



The Binn Quarry, Burntisland, Fife, in shale, associated with 

 Carbonia subula, Littorina scotoburdigalensis, Etheridge, 

 and Spirorbis sp. 



2. Carbonia Rankiniana, Jones and Kirkby. 

 (PI. III. figs. 1-8.) 



Cythere Rankiniana, J. & K. Trans. Geol. Soc. Glasgow, 1867, vol. ii. 

 'p. 217. 



Elongate, convex (usually), with the greatest height and 

 width at the posterior third ; height less than half the length. 

 Dorsal border sloping flatly from the posterior third towards 

 the anterior extremity, which is rounded ; ventral border 

 straight or slightly incurved ; posterior extremity rounded, 

 with an abrupt dorsal slope. Right valve rather the 

 largest, overlapping the left along the middle of the ventral 

 edge. Muscle-spot round or somewhat oval. A transverse 

 furrow is often shown on casts near the centre of each valve, 

 indicating a local contraction or partial thickening of the 

 shell at this spot. Surface usually smooth ; but in some speci- 

 mens a reticulation is discernible. Length ^L- to ^ inch. 



The muscle-spot is rarely seen in this species ; but the 

 transverse furrow (fig. 6) is often present in casts. This fea- 

 ture also characterizes C. subula ; and it has been noticed by 

 one of us in C. Agnes from the South- Wales coal-field. 



This species ranges through the same portions of the Car- 

 boniferous series as C. fabulina ; but, though widely distri- 

 buted, it is less abundant than that species. 



Localities and Mode of Occurrence. — Coal-measures : 

 Blakemoor, Wyre Forest, in ironstone, with fossils as be- 

 fore. 

 Hylton, W. of Sunderland, in ironstone. 



Shotts Iron-works, Lanarkshire, in ironstone and parrot-coal. 

 Ardrie, Lanarkshire, in blackband ironstone. 

 Carluke, Lanarkshire, in ironstone, with Spirorbis carbo- 



narius. 

 WhifBet, near Glasgow, in ironstone. 

 Provanhall, near Glasgow, in carbonaceous shale, with 



fossils as before. 

 Pirnie Colliery, Fife, in parrot-coal, with fossils as before. 



