134 



MOLLUSCA. 



Terebuatula. 



29- Terebratula pr^longa. — The Prolonged Tei-ebra- 

 tula, pi. LIV.* fig. 8 and 10. 



T. prcelonga. Sowerby, Geo. Trans. IV. 2nd series, p. 339; 

 pi. 14, fig. 14. 



Ovate, greatly elongated, gibbose; base a little elevated, with 

 a depression in its centre ; beak large, and prominent ; surface 

 smooth. 



Lower Greensand, near Sandgate, Kent. 



30. Terebratula sublobata. — The Sublobate Terebra- 

 tula, pi. LIV.* fig. 11, 12, 13. 



Atrypa sublobata. Portlock, Geo. Sur. p. 567, pi. 38, fig. 2, 

 a, b, c. 



Elongated ; dorsal valve generally grooved from the beak 

 to the base ; smaller valve also grooved, extending to the 

 margin, and more or less trilobate ; lines of growth crossing 

 the valves. 



In some instances this shell is pentahedral; and the longitudinal groove 

 line as in the upper valve, and frequently not extending to the margin ; 

 the trilobate form frequently disappears ; and in some cases the transverse 

 lines of growth are strongly imbricated. 



Carboniferous Strata, in the gritty bed at Hartness House, 

 Parish of Kiklress, Tyrone, Ireland. 



31. Terebratula Tamarinda The Tamarind Terebra- 

 tula, pi. LIV. fig. 37, 38. 



T. Tamarindus. Sowerby, Geo. Trans. V. 2nd series, p. 338, 

 pi. 14, fig. 8. 



Almost orbicular, smooth ; margin very obtuse ; disk rather 

 depressed ; beaks slightly curved, with an angular, flat ridge on 

 each side, passing down the margin of the valves. 



Lower Greensand near Hythe, County of Kent. 



32. Terebratula coarctata The Straitened Terebra- 

 tula, pi. LV.* fig. 3, 4. 



T.coarctala. Sowerby, IV. p. 7, pi. 312, fig. 1, 2, 3, 4. T. 

 reticulata, Smith, Strat. Syst. p. 83. Strata Identified, p. 30, 

 fig. 10. Terebratulites coarctatus, Parkinson, III. p. 229. 



Subheptagonal, gibbose ; length exceeding the width ; larger 

 valve biplicated, with a deep sulcus between the plates ; lesser 

 valve convex, subtrilobated; beak produced; whole surface de- 

 cussated with longitudinal, elevated stria;, and transverse stria?, 

 which cut the longitudinal ones, and with numerous minute, 

 tubular bristles, which are situated upon the angles of intersec- 

 tions of the striss. 



Great Oolite, Hinton, near Bath, &c. 



33. Terebratula decussata. — The Decussated Terebra- 

 tula, pi. LV.* fig. 21, 22. 



T. decussata. Lamarck, VI. p. 344. Ency. Meth. pi. 245, 

 fig. 4. Sowerby, IV. p. 8, pi. 312, fig. 5, 6. 



Obovate, gibbose; base obscurely three-sided; larger valve 

 obtusely biplicated, with a shallow groove between the ridges ; 

 lesser valve convex ; whole surface with longitudinal and trans- 

 verse stria?, producing a beautiful reticulated appearance, and 

 with blunt, rather obscure spines, which scarcely rise above the 

 surface, and appear as if pressed into it. 



Great Oolite, Hampton Clift", Bradford, and the Forest Mar- 

 ble, Pickwick and Frome. 



34. Terebrattla cornuta The Horned Terebratula, 



pi. LV.* fig. 10. 



T. cornuta. Sowerby, V. p. 66, pi. 446, fig. 4. 

 Irregularly pentagonal, short, convex, edges obtuse, four- 

 lobed, the central ones considerably produced, the others short ; 



beak short, incurved, with a sharp carina on each side ; whole 

 surface smooth, and shining. 

 Inferior Oolite, Ilminster. 



35. Terebratula digona The Digonal Terebratula, 



pi. LV. fig. 11, 12, 13. 



T. digona. Sowerby, I, p. 217, pi. 96, fig. 1 to 5. Ency. 

 Meth. pi. 240, fig. 3. Phillips, I. pi. 6, fig. 7. 



Triangular, oblong, gibbous; beak produced; sides rounded; 

 base convex in some specimens, and concave in others; bound- 

 ed by two prominent angles in the adult condition ; surface 

 minutely punctated, which is only conspicuous by the aid of a 

 lens. 



This species is liable to considerable variety of form. 



Cornbrash, Scarborough. 



36. Terebratula lampas. — The Lamp-shaped Terebra- 

 tula, pi. LV. fig. 10. 



T. lampas. Sowerby, L p. 228, pi. 101, fig. 3. 



Oval, subrhomboidal, gibbous; base parallel, produced; sides 

 of larger valve slightly concave ; lesser valve considerably de- 

 pressed. 



Lias, Lyme Regis. 



37. Terebratula ornithocephala The Bird's Head 



Terebratula, pi. LV. fig. 5. 



T. ornilhocephala. Sowerby, I. p. 227, pi- 101, fig. 1, 2, 4. 



Ovate, somewhat rhomboidal, elongated, gibbous ; base 

 straight, bounded by two obtuse lateral depressions, alike in 

 both valves ; beak with a large perforation ; the sides being 

 depressed, give an angular aspect to the base. 



Inferior Oolite, Linipley ; Lias, Lyme Regis. 



38. Terebratula ambigua The Ambiguous Terebra- 

 tula, pi. LV.* fig. 16. 



T. ambigua. Phillips, II. p. 221, pi. 1 1, fig. 21. 



Pentagonal ; base deeply undulated ; beak produced, with a 

 large circular aperture ; lesser valve with two longitudinal, cen- 

 tral ridges ; surface smooth. 



Carboniferous Limestone, Northumberland, Derbyshire, and 

 Pembrokeshire. 



39. Terebratula fimbria. — The Fringed Terebratula, 

 pi. LV.* fig. 25, 26. 



T.frnhriala. Sowerby, IV. p. 27, pi. 326. 



Orbicular, gibbose ; beak much rounded, with a pretty full 

 and round perforation; margin with a series of undulating plaits, 

 which occupy about a fifth part of the diameter of the valves, 

 from whenre the disk of the valves become suddenly inflated. 



Inferior Oolite, Charlton and Cheltenham. 



40. Terebratula punctata. — The Punctured Terebra- 

 tula, pi. LV. fig. 27, 28. 



T. punctata. Sowerby, I. p. 46, pi. 15, fig. 4. 



Oblong-ovate, subcompressed; valves equally convex; margin 

 straight at the base; vvhole surface with fine punctures, arranged 

 in undulating lines. 



Lias, Horton and Yorkshire. 



41. Terebratula ovata. — The Ovate Terebratula, pi. 

 LV.* fig. 34, 35. 



T. ovata. Sowerby, I. p. 46, pi. 15, fig. 3. Nilsson, Pet. 

 Suec. pi. 4, fig. 3. 



Ovate, or oblong-oval, compressed; lesser valve slightly pent- 

 angular, and subdepressed ; beak considerably produced; whole 

 surface smooth. 



