SPIRIFERA. 19 



I have not had the opportunity of studying either its interior or intimate shell-structure ; 

 this last appearing to be so altered, that I am unable positively to decide whether it was 

 perforated or otherwise. Indeed, some of the American examples in my possession lead 

 me to suppose the structure to be fibrous, and that the species may belong to the genus 

 Athyris or Merista. It is therefore placed provisionally only into the genus Terebratula. 



Family— SPIRTPERIDJJ. 



Genus — Spirifera, Sowerby. 

 (General Introduction, Vol. I, p. 79.) 

 Spirifera striata, Martin. Plate II, figs. 12 — 21 ; Plate III, figs. 2 to 6. 



Anomites striatus, Martin. Pet. Derb., tab. xxiii, 1809. 



Terebratula striata, Sow. Lin. Trans., xii, part ii, p. 515, pi. xxviii, figs. 1 and 2, 

 1815. 

 — spirifera, Fal.'m Lamarck. An. sans Vert., vol. vi, No. 59, 1819; 



and Bav., Annals and Mag. of Nat. Hist., vol. v, 2d series, 

 p. 449, 1850. 

 Spirifer striatus, Sow. Min. Con., tab. 270, May, 1820. 



— attenuatus, J. de C. Sow. Min. Con., vol. v, p. 151, tab. 493, figs. 3, 4, 5, 



May, 1825. 



— striatus and attenuatus, Fleming. Brit. Animals, p. 375, 1828. 



— — Bavreux. Const. Geogn. de la Province de Liege, p. 273, pi. vii, 



fig. 2, 1831. 



— — and attenuata, Phillips. Geol. of Yorkshire, vol. ii, pp. 217, 



218, pi. ix, fig. 13, 1836. 



— — — Von Buck. Ueber Delthyris, p. 47, 1837 and 



1840. 



— — — Be Koninck. Animaux foss. de la Belgique, 



p. 256, pi. xv bis, fig. 4, 1843. 



— striata, M'Coy. Synopsis of the Carb. Foss. of Ireland, p. 135, 1844. 



— princeps, M'Coy. Ibid., p. 133, pi. xxi, fig. 1. 



— attenuata, M'Coy. Ibid., p. 129. 



— clatharata, M'Coy. Ibid., p. 130, pi. xix, fig. 9. 



— striata, Be Fern. Russia and Oural, vol. ii, p. 167, pi. vi, fig. 4, 1845. 



— — M'Coy. British Palaeozoic Fossils, p. 222, 1855. 



Spec. Char. A very large and variably shaped shell, transversely semicircular, or 

 sub-rhomboidal ; valves almost equally convex. In the dorsal valve the mesial fold is of 

 moderate elevation, while the sinus in the opposite one is both variable in its width 



