42 BRITISH CARBONIFEROUS BRACHIOPODA. 



a deep sinus extending to the beak, and in the casts marked by a central linear furrow ; 

 the ventral valve {our dorsal one) with a rounded central rise marked in the centre by a 

 linear furrow approximating it to Sp. pingens. The sulci between the central plait and 

 the lateral costse strongly marked ; the number of the lateral costse variable, being some- 

 times three and at other times six on each side ; the general form rounded, appoaching 

 to that of Sp. speciosa" 

 Loc. Kildress, Ireland. 



Spirifkmna (?) insculpta, Phillips. Plate VII, figs. 48 — 55. 



Spirifera insculpta, Phillips. Geol. of Yorkshire, vol. ii, p. 216, pi. ix, figs. 2 and 

 3, 1836. 



— crispus and heteroclytus, De Koninck (not Linnceus nor Defiance). 



Animaux fossiles de la Belgique, pp. 257 

 and 259, pi. xv, figs. 7, 8, and pi. xv bis, 

 fig. 1, 1843. 



— quinqueloba, M'Coy. Synopsis of the Carb. Fossils of Ireland, p. 134, 



pi. xxii, fig. 7, 1844. 



— Koninckiana, D ' Orbigny . Prodrome, vol. i, p. 119. 



— insculpta, Semenow. Ueber die Fossilien des Schlesischen Kohlenkalkes, 



1854. 



— — De Koninck. Animaux fossiles de la Belgique (Supplement), 



p. 658, 1851. 



Spec. Char. More or less semicircular, about one third wider than long ; hinge-line 

 straight, and as wide as the greatest width of the shell. Area large, triangular, and but 

 slightly curved ; fissure wide ; beak very small, and not much produced above the level 

 of the area. Valves almost equally convex. The ventral one is ornamented by five 

 (rarely seven) large, bold, angular ribs, the central one exceeding the others somewhat in 

 proportions, and corresponding with the. deep angular sinus of the opposite valve. Six 

 angular ribs exist on the ventral valve ; these, as well as those on the dorsal one, being 

 intersected by close, concentric laminae of growth. Shell- structure minutely perforated. 

 Dimensions taken from two individuals have produced — 



Length 8, width 11, depth 6 lines. 

 6£, „ 11, „ 7 lines. 



Obs. Phillips's short description and illustrations convey a clear idea of the adult or 

 full-grown condition of the shell under description. Its few bold ribs distinguish it from 

 Sp. cristata and its var. octoplicata, as well as from Sp. minima and Sp. laminosa. It has 

 been taken for the Anomia crispa of Linnaeus, as well as for the Terebratulitis cristata of 

 Schlotheim, but seems specifically distinguished from both by the small difference that 

 exists in the proportions of its central rib or plait relative to the lateral ones, which in the 

 above-named species and varieties are much more disproportionate. Sp. quinqueloba 





