62 BRITISH CARBONIFEROUS BRACHIOPODA. 



original Gilbertsonian example in the British Museum, and from which it will be perceived 

 that up to a certain age the shell was entirely smooth, but that after an interruption in its 

 regular growth, some slightly marked ribs were suddenly produced (figs. 3 — 5). It will 

 therefore be necessary to look upon these and similar specimens as exceptional shapes, as 

 we would do for figs, 1 and 2 of the same plate. 



Professor De Koninck has recently informed me that he feels disposed to separate 

 those more flattened specimens with smaller beak and finer shell-texture (?) from Sjj. glabra 

 proper (PI. XI, figs. 3, 4), by the name of Sp . glob err imus ; that in the last-named shell 

 the mesial fold is at all ages uniformly and evenly convex, while in Martin's 8. glabra it is 

 divided by a longitudinal depression or furrow ; but as I have not been able to convince 

 myself that these characters have any real permanency, I must leave to other palaeonto- 

 logists to decide whether we can adopt the learned Professor's suggestion. 



Sp. glabra lias been mentioned as occurring in the Devonian rocks of several localities, 

 and I possess small specimens from Barton, in Devonshire, which appear undistinguishable 

 from some from the Carboniferous limestone. 



Loc. Sp. glabra is one of the most abundant of Carboniferous limestone fossils. 

 Martin's specimens were obtained at Chelmerton, Tideswell, and in several other localities in 

 the gray limestone of Derbyshire. Sowerby mentions Scaliber, near Settle, in Yorkshire, 

 and Axton Quarry, south-west of Llanasa, in Flintshire. It is abundant at Bolland, and 

 in lower dark Carboniferous limestone of the Isle of Man, in that of Lowick, Northumber- 

 land, at Kendal, and in numerous other English localities. In Scotland it occurs at 

 Harestanes and Hill Head, near Carluke, as well as at Beith, Ayrshire. In Ireland, Mr. 

 Kelly furnishes us with the following localities : Malahide, Little Island, Carrownanalt, 

 Clonea, Mullaghboy, Mullaghfin, Cornacarrow, Millecent, &c. On the Continent it is 

 also a very common Carboniferous limestone fossil at Vise, Tournay, &c., in Belgium ; at 

 Ratingen ; at Sable, in France.; and it has also been collected in Russia, America, &c. 



Spirifera lineata, Martin. PI. XIII, figs. 1 — 13. 



CoNCHlLlOLiTHUS ANOMITES LiNEATUS, Martin. Petrif. Derby., tab. xxxvi, fig. 3, 1809. 

 Teuebratula lineata, Sow. Min. Con., vol . iv, p. 39, tab. cccxliii, figs. 1, 2, March, 1822 

 (not tab. ccccxciii, fig. 1). 

 — IMBRICATA, Sow. Ibid., pi. cccxxxiv, fig. 3. 



Spirifera Martini, Fleming. British Animals, p. 3/6, 1828. 



— lineata, Phillips. Geol. of Yorksh., p. 219, pi. x, fig. 17, 1836. 



— ELLIPTICA, Phillips. Ibid., fig. 16. 



— IMBRICATA, Phillips. Ibid., fig. 20. 



— MESOLOBA, Phillips. Ibid., fig. 14. 



— LINEATUS, Fon Buch. Memoirs de la Soc. Geol. de France, vol. iv, p. 199, 



pi. X, fig. 26, 1840. 



— — he Koninck. Animaux fossiles de la Belgique, p. 270, pi. vi, fig. 5, 



and pi. xvii, fig. 8, 1843. 



