136 
MOLLUSCA. 
Terebratula. 
56. Terebratula neglecta, —The Neglected Terebra¬ 
tula, pi. LVI. fig. 37* 
T. neglecta. Sowerbv, 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 . Sovvcrby, 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. borealis. Schloth. T. lacunosa , Sowerby, Sil. Syst. p. 611, 
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. 
Wcnlock 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 crispata —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 imbricata —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. 21. 
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 shorter, 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^ lines; depth 3 lines. 
Wenlock Shale, Woolhope and Delves Green. 
66 . Terebratula spilerica. —The Spherical Terebra¬ 
tula, pi. LV.* fig. 86 , 87. 
T. spluerica. Sowerby, Sil. Syst. p. 6.31, 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. 
66 . Terebratula Nucula —The Kernel Terebratula, pi. 
LVI. fig. 1, 2. 
T. Nucula . Sowerby, Sil. Syst. p. 603 and 611, pi. 5 , fig. 20. 
Globose, obscurely trilobate; lower valve slightly flattened; 
beak small, adpressed; 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 , but 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. 
pedunculate r, Schloth, Min. Tosch. VII. pi. 1 , fig. 3 . 
Suborbit ular ; 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. 
