80 BRITISH CARBONIFEROUS BRACHIOPODA. 



Loc. In England A. lamellosa has been found in tlie Carboniferous limestone of Settle, 

 Yorkshire; Dovedale, Derbyshire, &c.; Professor Phillips mentions Kendal and Florence court. 

 It occurs also at Hook Point, in Ireland. I am not acquainted with any Scottish examples. 

 Professor De Koninck states he has found but a single example in the Carboniferous 

 limestone of Vise, but that it is more abundant in the clay of the same formation of 

 Tournay, in Belgium. In America it has been found by Mr. Worthen in the mountain 

 hmestone of Keokuk, Iowa. 



Athyris planosulcata, PJdllips. PI. XVI, figs. 2 — 13, 15. 



Spirifeka planosulcata, Phillips. Geol. of York., vol. ii, p. 220, pi. x, fig. 15, 1836. 

 Terebkalcta de Roissyi, De Ferneuil. Bulletin de la Societe Geol. de France, vol. xi, 



p. 259, pi. iii, fig. 1 a, 1840 (not Sp. de Roissi/i, L'Eveille, 



1835). 

 Atrypa planosulcata, /. de C. Sowerhy. Min. Con., vol. vii, p. 15, pi. dcxvii, fig. 2, 1840. 



— OBLONGA. Ibid., fig. 3. 



— PLANOSULCATA, De KoniticTc. An. Foss. de la Belgique, p. 301, pi. xxi, fig. 2, 1843.'' 

 AcTiNocoNCHUS PARADOXUS, M'Coy. Synopsis of Garb. Foss. of Ireland, pi. xxi, fig. 6, 



1844. 

 Atrypa obtusa, M'Coy. Ibid., pi. x.xii, fig. 20. 

 Athyris paradoxa, M'Coy. British Palaeozoic Fossils, p. 436, 1855. 



Spec. Char. Obscurely pentahedral or nearly orbicular; valves equally deep, and 

 either moderately or evenly convex, without sinus or fold, or with a slight mesial depression 

 towards the front in one or both valves. The beak is small or incurved, with a minute 

 circular foramen placed close to the umbone of the opposite valve. Surface of both valves 

 ornamented at intervals of less than a line, with numerous large, concentric, parallel, 

 semicircular, lamelliform expansions, each plate being flat and longitudinally striated at 

 about half a line apart. Interiorly the spiral appendages, which are each composed of from 

 twelve to fifteen coils, fill the larger portion of the shell. 



The following'^measurements of the same specimens, with and without theu" expansions, 

 will convey some idea of the relative proportions. 



Without expansions. The same. With expansions. 



Length 11^ width 11, length 20, width 24^ lines. 

 „ 8^, „ 12, „ 15, „ 21 „ 



„ 14, „ 15, „ 25, „ 33 „ 



19^, „ 21, depth 13, extent of expansions not known. 

 „ 12, „ lOi „ 8, ditto, 



1 Sp.fimhriata and S. expaiisa, Phillips, mentioned by Professor De Koninck, will require to I)e ex- 

 cluded from the synonyms of A. planosulcata. 



