136 



MOLLUSCA 



The Neglected Terebra- 



Teeebratula. 



56. Terebratula neglecta.- 

 tula, pi. LVI. fig. 37. 



T. neglecta. Soweiby, Sil. Syst. p. 641, pi. 21, fig. 14. 

 Orbicular, convex ; beaks small ; with seventeen acute plaits. 

 Caradoc Sandstone, Mondinam, Llandovery. 



57. Terebratula furcata — The Forked Terebratula, 

 pi. LVI. fig. 47, 48, 49. 



T. furcata. Sowerby, Sil. Syst. p. 640, pi. 21, fig. 16. 



Orbicular, very smooth ; beak of one valve greatly curved ; 

 interior with several furrows, and a furcate channel in the mid- 

 dle. Diameter four lines. 



Caradoc Sandstone, Corndon Hills. 



58. Terebratula borealis. — The Northern Terebratula, 

 pi. LVI.* fig. 40, 41. 



T.horealis. Schloth. T. /ncuno««, Sowerby, Sil. Syst. p. 61 1, 

 pi. 5, fig. 19. T.plicatella, Dalman, pi. 6, fig. 12. 



Obovate, gibbose, obscurely three-lobed; beak small, pointed, 

 slightly incurved ; with about sixteen acute plaits, four or five 

 middle ones much elevated at the base. Length seven lines ; 

 width eight lines. 



Upper Ludlow Rocks, Ludlow promontory, and Delbury, 

 Salop ; Abberley Hills ; Aram, near Newnham, &c. 



59. Terebratula brevirostra. — The Short-beaked Te- 

 rebratula, pi. LVI. fig. 3, 4. 



T. brevirostra. Sowerby, Sil. Syst. p. 631, pi. 13, fig. 15. 



Transversely elliptical; valves very convex, and nearly equal; 

 beaks large, and short ; with about twenty-five sharp plaits. 

 Length four lines ; width six lines. 



Wenlock Shale, Croft Valley and Woolhope. 



60. Terebratula Stricklandii Strickland's Terebra- 

 tula, pi. LVI.* fig. 28, 29. 



T. Stricklandii. Sowerby, Sil. Syst. p. 631, pi. 13, fig. 19. 



Transversely obovate, ventricose; the upper valve more con- 

 vex than the other ; beaks small, adpressed, and pointed ; close 

 to that of the upper valve is a longitudinal canal ; with about 

 thirty sharp plaits, five of them elevated on the base, producing 

 a broad projection in the upper valve, and a corresponding canal 

 in the under valve ; contiguous to the beaks the sides are 

 smooth. Length eleven lines ; width thirteen lines. 



Wenlock Shale, Longhope. 



61. Terebratula crebricosta. — The Many-plaited Te- 

 rebratula, pi. LVI.* fig. 31,32. 



T. crebricosta. Sowerby, Sil. Syst. p. 631, pi. 13, fig. 18. 



Transversely obovate, subcylindrical, depressed ; beaks small, 

 acute; with about thirty rather sharp plaits, six or eight of them 

 elevated into a deep sinus on the edge of the upper valve. 

 Length seven lines ; width eight lines. 



Wenlock Shale, Tynewidd, Llandovery. 



62. Terebratula cbispata — The Curled Terebratula, 

 pi. LVI. fig. 80. 



T. crispata. Sowerby, Sil. Syst. p. 624, pi. 12, fig. 11. 



Rhomboidal, convex, transverse ; beaks small, subtrilobate ; 

 with about eighteen acute plaits, all of them terminating on the 

 base, about six of them elevated in the middle ; sides smooth. 

 Length ten lines ; width eleven lines. 



Wenlock Limestone, Nath Scar. 



63. Terebratula imbbicata The Imbricated Terebra- 

 tula, pi. LV. fig. 89, and pi. LVI.* fig. 16, 17, var. 



T. imbricata. Sowerby, Sil. Syst. p. 624, pi. 12, fig. 12, and 

 p. 634, pi. 13, fig. 27. 



Transversely obovate, trilobate ; with many bifurcated and 

 trifurcated plaits, crossed by imbricating scales, more especially 

 near the edge ; base much elevated. Diameter eight lines. 



Wenlock Limestone, Wenlock Edge. 



The variety, pi. LVI.* fig. 16, 17, is sliorter, and generally much 

 more ventricose, and is from the Wenlock Shale, Woolhope ; Stumps 

 Wood ; Hay Head ; Tame Bridge ; and Croft. 



64. Terebratula interplicata — The Interplaited Te- 

 rebratula, pi. LVI. fig. 7, 8. 



T. interplicata. Sowerby, Sil. Syst. p. 631, pi. 13, fig. 23. 



Transversely obovate; valves nearly equal, and very convex; 

 beaks short, and almost equal in length ; with many plaits, and 

 about fourteen principal ones, the four central ones depressed on 

 the base, and between each of the lateral ones is an intervening 

 shorter plait ; sides near the beaks smooth, with their edges pro- 

 minent. Length 5 lines ; width 5^ fines ; depth 3 lines. 



Wenlock Shale, Woolhope and Delves Green. 



66. Terebratula sph.«rica. — The Spherical Terebra- 

 tula, pi. LV.* fig. 86, 87. 



T. sphcerica. Sowerby, Sil. Syst. p. 631, pi. 13, fig. 17. 



Orbicular, ventricose ; beaks equal; with about fourteen rather 

 obtuse, and frequently forked plaits, the three or four central 

 ones much depressed on the base, forming a longitudinal canal ; 

 sides concave. Diameter about six lines. 



Wenlock Shale, Tame Bridge. 



60. Terebratula Nucula The Kernel Terebratula, pi. 



LVI. fig. 1, 2. 



T. Nucula. Sowerby, Sil. Syst. p. 603 and 61 1, pi. 5, fig. 20. 



Globose, obscurely trilobate ; lower valve slightly flattened ; 

 beak small, adpre.ssed ; with about fifteen sharp plaits, three or 

 four of which are prominent, and elevated in the centre of the 

 base. Diameter five lines. 



Upper Ludlow Rock at Ludlow; Delbury; Presteign, and a 

 number of other localities ; also in the Old Red Sandstone at 

 Horeb Chapel. 



67. Terebratula concinna The Neat Terebratula, pi. 



LV.* fig. 55. 



T. concinna. Sowerby, Min. Conch. I. p. 192, pi. 83, fig. 6. 



Almost globose; width somewhat more than its length; beak 

 projecting, and very sharp-pointed ; centre elevated by seven 

 plates, with twelve or more uniform, well-defined, sharp plaits, 

 which are well defined and acute to the very beaks; length and 

 depth nearly equal. 



Great Oolite, Aynhoe. 



68. Terebratula pulchra The Beautiful Terebratula, 



pi. LVI. fig. 35. 



T. pulchra. Sowerby, Sil. Syst. p. 612, pi. 5, fig. 21. 



Globose, somewhat triangular ; beak small, produced ; ob- 

 scurely trilobate; with about twenty sharp plaits, the five central 

 ones elevated at the base. Diameter four lines. 



This resembles T. Nucula, hut is more angular, with smaller and 

 sharper plaits, differing from the more clumsy aspect of that species. 



Upper Ludlow Rock, Delbury ; Bagbarrow Hill ; and Melverns. 



69. Terebratula rostrata. — The Beaked Terebratula, 

 pi. LV.* fig. 46, 47. 



T. rostrata. Sowerby, VI. p. 71, pi. 537, fig. 1, 2. T. 

 pectunculata, Schloth, Min. Tosch. VII. pi. 1, fig. 3. 



Suborbicular ; beak large and projecting, with its inner sur- 

 face more convex than in most species, slightly incurved, and 

 rather acute at the point ; surface with nearly thirty rounded 

 plaits; front a little elevated, but irregular. 



