TEREBRATULA. 55 



22. Tererratula biplicata, Brocchi, Sp. Plate VI, figs. 1 — 49, and Plate IX, fig. 40? 



Anomia biplicata, Brocchi. Conchologia fossile, p. 469, pi. x, fig. 8, 1814. 

 Terebratula biplicata, Sowerby. Min. Con., vol i, p. 201, tab. 90, 1815, and vol. v, 



p. 53, tab. 437, fig. 2, 3, 1825. 



— — Parkinson. An Int. to the Study of Organic Remains, p. 



227, 1822. 



— obtusa, Sow. Min. Con., vol. v, p. 53, tab. 437, fig. 4, 1825. 



— biplicata, Befrance. Die. des Sciences Nat., vol. liii, p. 151, 1828. 



— — Woodward. A Synoptical Table of Brit. Organic Remains, 



p. 21, 1830. 



— — and T. obtusa, Brown. Illustrations of Fossil Conch, of 



Great Britain, pi. lii, figs. 27, 28, and pi. liv, fig. 25, 1835. 



— faba, Sowerby. (in Fitton). Trans. Geol. Soc, vol. iv, p. 338, pi. xiv, 



tab. 10, 1836, (not T.faba, Sow. d'Orbigny, Pal. Tran., vol. iv.) 



— biplicata, (part) Von Buck. Class, des Terebratules, Mem. Soc. Geol. 



de France, vol. iii, p. 219, 1839. 



— biplicata and obtusa, Morris. Catalogue, 1843. 



— Dutempleana, D'Orbigny. Pal. Franc., Terrains Cretaces, vol. iv, p.[93, 



pi. 511, figs. 1—8, 1847- 



— biplicata, (part) Bronn. Index Pal., p. 1230, 1848. 



— — and obtusa. Catalogue of the Terebratulse, in the British 



Museum, pp. 23, 24, 1853. 



— — Sharpe, Quart. Journ. Geol. Soc, vol. x, p. 191, 1843. 



Diagnosis. Shell oblong, oval, somewhat pentagonal : ventral valve convex, and in 

 general deeper than the dorsal one, which is more or less prominently implicated ; beak 

 short, rounded, incurved, and obliquely truncated by a circular foramen of moderate 

 dimensions^ Deltidium very narrow, and generally inconspicuous from the aperture being 

 contiguous to the umbo of the dorsal valve : lateral margins flexuous, bisinuated in front ; 

 surface smooth, marked by concentric lines of growth, and at times obscurely striated on 

 the sides ; loop simple, not exceeding one third of the length of the socket valve. Dimen- 

 sions variable; length 23, width 16, depth 11 lines. 



Obs. It was not until after much consideration and repeated comparisons of more 

 than three thousand examples, that I could make up my mind to refer to a single species 

 the biplicated terebratula illustrated in Plate VI. of the present monograph. 



The term Anomia biplicata was first introduced by Brocchi for a cretaceous terebratula 

 from San Quirico, in Tuscany ; no description was appended, but the figure then published 

 represents a smooth, oblong oval., or somewhat pentagonal shell, 14 lines in length, by 9 in 

 breadth, notched or biplicated towards the front, with a slightly incurved beak, circular 

 foramen and inconspicuous deltidium. Nothing more appears to be known of this Italian 

 shell except that the same locality is mentioned for Bh. vespertilio. 



One year after the publication of Brocchi's work, Sowerby described, under a similar 

 denomination, a biplicated terebratula, common in the Gault of Folkstone, and Upper Green 



8 



