54 BRITISH DEVONIAN BRACHIOPODA. 



Atrypa affinis, Sowerby, in Murchison's 'Silurian System,' pi. vi, fig. 5, 1839. 



Delthyris prisca, Fahrenb., in Bull. Mosc, p. 788, 1844. 



Terebratula (Atrypa) prisca, Phill. Figures and Descriptions of the Palaeozoic Fossils 



of Cornwall, Devon, and West Somerset, p. 81, pl.xxxiii, 



fig. 144, 1841. 



— insperata, Phillips. Ibid., p. 83, pl.xxxiii, fig. 17, 1841. 

 Spirifer affinis, Sow. Trans. Geol. Soc, 2nd series, vol. v, pi. lvii, fig. 11. 

 Terebratula prisca, D'Arckiac and De Verneuil- Trans. Geol. Soc, 2nd series, vol. vi, 



p. 392. 



— prisca, A.Roemer. Die Versteinerungen des Harzgebirges, pi. v, figs. 1 1 — 13, 



1843. 



— reticularis, Be Verneuil. Geol. of Russia and the Ural Mount., vol. ii, 



pi. x, fig. 12, 1845. 

 Atrypa lentiformis, Vanuxem; and A. affinis, Hall. Geology of the State of New York, 



1846. 

 Terebratula reticularis, Barrande. Ueber die Bracbiopoden Silurischen Schichten von 



Boehmen, pi. xix, fig. 8, 1847. 



— — Bronn. Index Palseontologicus, p. 1248, 1848. 

 Spiriferina — BfOrbigny. Prodrome, vol. i, p. 99, 1849. 



Terebratula prisca, Quenstedt. Handbuch der Petrefactenkunde, p. 461, tab. xxxvii, 



figs. 1—4, 1851. 

 Atrypa reticularis, Davidson. British FossU Brachiopoda, Introduction, vol. i, pi- vii, 



figs. 87—93, 1853. 

 Terebratula insquamosa, Schnur. Dunker und Meyer's Palseontographica, vol. iii, p. 181, 



fig. 4, 1853. 

 Atrypa reticularis, Morris. A Catalogue of British Fossils, p. 132, 1854. 

 Anomia — Sharpe, in Hanley's 'Ipsa Linnsea Conchylia,' p. 127, 1855. 



Spirigerina — M'Coy. British Palaeozoic Fossils, p. 379, 1852. 



— — Sandberger. Die Bracbiopoden des Rbeinischen Schichtensystems 



in Nassau, p. 51, pi. xxxiii, fig. 1, 1851. 

 Atrypa — Woodward. A Manual of the Mollusca, p. 228, figs. 144, 145, and 



pi. xv, fig. 21, 1856. 



— — J. Hall. Report on the Geological Survey of the State of Iowa, pi. vi, 



figs. 4 and 5, 1858. 



— — Hall. Natural Hist, of New York, Palaeontology, vol. iii, p. 253, 



pi. xlii, fig. 1, 1862. 



(Many more references could be added, but the list above given contains the most 

 important.) 



Spec. Char. Shell oblong ovate, widest near the hinge ; beak small, acute, very little 

 produced, incurved, and often pressed to the unibone of the ventral valve, so that the small 

 circular foramen, situated under its incurved extremity, is rarely perceptible. Dorsal valve 

 uniformly convex, at times gibbous, and without any defined fold, but becoming slightly 

 concave towards the cardinal extremity or on either side of the umbone. Ventral valve much 

 less convex and deep than the opposite one, convex at the beak and along the middle, but 

 becoming gently concave towards the lateral portions or margins of the valve ; front margin a 



