76 DE. T. DAVIDSON ON EECENT BEACHIOPODA. 



Anomia striata Mayellanica, Chemnitz, Neues syst. Coocli. -Cabinet, vol. viii. p. 101, tab. 78. figs. 710, 

 711, 1785. 



Terebratula dorsata, Gmelin, ed. Linne's Syst. Nat. vol. iv. p. 3348, 1788; Bruguiere, Encycl. Meth. 

 pi. 242. fig. 1, 1789 ; Lamarck, An. sans Vert. vol. vii. p. 246, 1819 ; G. B. Sowerby, A Catalogue of Shells 

 of the late Earl of Tankerville, p. 28, 1825. 



Terebratula bilohata, Blainville, Diet. Sci. Nat. vol. liii. p. 166, 1828 (refers for fig. to Encycl. Meth. 

 pi. 242. fig. 1). 



Delthijris dorsata, Menke, Synopsis Methodica Molluscorum, 2nd ed. p. 96, 1830. 



Terebratula chilensis, Broderip, Trans. Zool. Soc. vol. i. p. 141, pi. 22. fig. 1, 1833 ; Owen, On the 

 Anatomy of the Brachiopoda, Trans. Zool. Soc. vol. i. p. 146, pi. xxii. figs. 3-11, 1833. 



Terebratula Sowerbii, Owen, Ou the Anatomy of the Brachiopoda, Trans. Zool. Soc. vol. i. p. 149, 

 pi. xxii. figs. 15, 16, 1833 ; King, Zool. Journ. vol. v. p. 338, 1835. 



Terebratula dorsata, Anton, Verzeichuiss der Conchylien, p. 23, 1839; Kiister, Chemnitz's Conch. - 

 Cab. vol. vii. p. 23, pi. 1. fig. 17, pi. 2. figs. 14, 15, 1843. 



Terebratula lupinus, Philippi, Neuen Conchylien, Archiv fiir Naturgeschichte, Jahrg. xi. Band i. p. 58, 

 1845. 



Terebratula dorsata, King, Ann. & Mag. Nat. Hist. 1st ser. vol. xviii. p. 39, 1846; G. B. Sowerby, 

 Thes. Conch, p. 346, pi. Ixviii. figs. 15-17, 1846. 



Terebratula Chilensis, G. B. Sowerby, Thes. Conch, p. 347, pl. Ixviii. figs. 18, 19, 1846. 



Terebratula Soverbii, G. B. Sowerby, Thes. Conch, p. 348, pl. Ixviii. figs. 20-22. 



Terebratula dorsata and T. chilensis, A. d'Orbigny, Voyage dans I'Amer. Merid. vol. v. pp. 675, 676, 



1847. 



Terebratella chilensis, d'Orbigny, Mem. de I'Acad. des Sci. pl. vii. fig. 13, 1847. 



Terebratella dorsata and T. Chilensis, Davidson, Sketch of a Class, of Recent Brach., Ann. & Mag. 

 Nat. Hist. 2nd ser. vol. ix. p. 367, 1852, and Br. Foss. Brach., Pal. Soc. vol. i. Introduction, p. 65, pl. vi. 

 figs. 11-13, 1853. 



Terebratula dorsata, T. Chilensis, and T. Soverbii, Woodward & Gray, Cat. of the Brach. in the Brit. 

 Mus. pp. 87, 88, 1853. 



Terebratula dorsata, S. P. Woodward, A Manual of Mollusca, p. 217, fig. 115, 1856. 



Terebratella dorsata, E. Suess, Ueber die Wohnsitze der Brachiopoden, Sitzungsb. k. Akad. Wissenseh. 

 Wien, Bd. xxxvii. p. 208, 1859. 



Terebratula {Terebratella) Mayellanica, Reeve, Conch. Icon, vol.xiii. pl. v. figs. 21, a-d, 1860 ; Ann. & 

 Mag. Nat. Hist. 3rd ser. vol. vii. p. 176, 1861. 



Terebratella dorsata, Dall, Amer. Journ. Conch, vi. p. 116, 1870; Proc. Acad. Nat. Sci. Philadelphia, 

 p. 184, 1873; Zittel, Handb. der Palaontologie, p. 705, fig. 552, 1880; Davidson, Report on the 

 Brachiopoda, Voyage of H.M.S. 'Challenger,' Zoology, vol. i. p. 44, pl. iv. fig. 4, 1880. 



Shell somewliat transversely oval, wider than long, or of a suborbieular trapezoidal 

 form, broader posteriorly, tapering anteriorly, vritb a mesial flattened sinus of moderate 

 breadth and depth, commencing at about one third of the length of the valve and 

 extending to the front. Ventral valve deeper than the dorsal one, with a moderately broad, 

 gently convex mesial fold of small elevation, corresponding to the sinus in the opposite 

 valve ; margin flexuous in front, the fold and sinus projecting a little beyond the curved 

 lateral margins ; beak moderately produced, incurved, and truncated by a large circular 

 foramen, very little separated from the hinge-line by a deltidium in two pieces ; beak- 

 ridges sharply defined, and leaving a flattened space between them and the long obtusely 

 angular hinge-line. Surface of valves marked n'ith numerous narrow angular ribs, 



