TEREBRATULA. 59 



Griesbach and Mr. Morris ; it is named after Mr. Bentley, at the request of Mr. Morris : a 

 fine specimen is to be seen in the collection of Mr. Lee. T. Bentleyi is a rare species, 

 at least in England, few specimens having been as yet discovered. 



T. Bentleyi. Var. Sub-Bentleyi, Dav. Plate XIII, fig. 11. 



We are indebted to Mr. Lycett for the discovery of the larger valve of a terebratula 

 which we believe to be only a well-marked variety of the above-described species, to which 

 it approaches by general character ; its shape, however, is more elongated, deeper, and the 

 medio-longitudinal sinus, in appearance, extends only to a short distance from the front ; 

 the lateral beak ridges are also less defined than in T. Bentleyi. Unfortunately we are 

 only acquainted with one of the valves of this shell, which may, perhaps, prove specifically 

 distinct when the other is obtained. Its stratigraphical position is likewise very different, 

 belonging to the Inferior Oolite of the neighbourhood of Minchinhampton, where it seems 

 rare ; the dimensions are larger than those of T. Bentleyi, measuring in length 22, in 

 breadth 18 lines. Fig. 11 is from the collection of Mr. Lycett. 



57. Terebratula coarctatus, Parkinson. Plate XII, Pigs. 12 — 15. 



Terebratula coarctatus, Parkinson. 1811. Organic Remains, vol. iii, pi. xvi, fig. 5. 



— reticulata, Smith. 1816 — 1819, Strata identified by Organised Fossils, 



p. 83, pi. xxx, fig. 10. 



— decussata, Lamarck. 1819. Anim. sans Vert., vol. vi, No. 51. Enc. 



Methodique, t. 245, fig. 4. 



— — Dav. Annals and Mag. of Nat. Hist., June 1850, pi. xiv, fig. 51. 

 Terebratulites reticularis, Schloth. 1820. Petref., vol. i, p. 269. 

 Terebratula coarctata, Sow. 1823. Min. Con., vol. iv, p. 7, tab. 312, figs. 1 — 4. 



— reticulata, Sow. 1823. Min. Con., vol. iv, p. 8, tab. 312, figs. 5 — 6. 



— decussata and reticulata, Deslong champs. 1837. Soc. Linn, de 



Normandie. 



— reticularis, V. Buch. 1838. Mem. Soc. Geol. de France, vol. iii, 



l" e Serie, p. 185, pi. xvii, fig. 7. 



— decussata, Morris. 1843. Catalogue, p. 132. 



— — Tennant. 1847. Stratigrapbical List of British Fossils, p. 73. 



— coarctata, Bronn. 1849. Index Palaeont, vol. ii, p. 1232. 



— — D'Orb. 1849. Prodrome, vol. i, p. 316. 



Biagnosis. Shell inequivalved ; subpentagonal, valves convex, sometimes gibbous, 

 hisped, decussated, and notched in front ; perforated valve biplicated, with a more or less 

 deep angular sulcus between the plaits, extending from the extremity of beak to the front ; 

 beak moderately produced, truncated by a large entire circular foramen, separated from 

 the umbo by a more or less wide deltidium, often receding; beak ridges indistinct. 

 Smaller valve convex, subtrilobated with medio longitudinal plait; surface of valves covered 

 by a great number of short tubular spines, arranged longitudinally so as to form minute 



