PLATE LV.* 
I, 2. Terebratula Cuneata. (Wedge-shaped Terebratula.) Triangular; beak of larger valve straight, produced; with ten to twelve plaits. 
Length, £ in.; depth of each valve, $ in. 
3, 4. T. Coartata. (Straitened Terebratula.) Sub-heptagonal, gibbose; larger valve biplicatcd, with deep sulcus between the plates; 
lesser valve convex, sub-trilobated; beak produced; decussated with longitudinal and transverse stria), and with many, minute bristles. 
5. T. Opnithocephala. (Bird's Ucad Terebratula.) V . Plate LIV.*, Fig. 23. 
6, 7. T. Seminula. (Little Seed Terebratula.) Orbicular ; beak pointed ; perforation small; smooth, with one lateral plait. 
8, 9. T. Similis. (Similar Terebratula.) 
9*. T. Lampas. (Lamp-shaped Terebratula.) Oval, sub-rhomboidal, gibbous ; base parallel, produced ; sides of larger valve concave ; smaller 
valve depressed. 
10. T. Cornuta. (Homed Terebratula.) Pentagonal, short, convex; edges obtuse, four-lobed; beak short, incurved, with sharp carina on 
each side; smooth, shining. 
II, 12, 13. T. Digona. (Digonal Terebratula.) Triangular, oblong, gibbous; beak produced; sides rounded; base convex or concave; with 
two prominent angles in adult; minutely punctated. 
14,15. T. Pentagonalis. (Pentagonal Terebratula.) Pentagonal; beak produced; sides parallel; with mesial sulcus from beak of larger 
valve to base; smaller valve, depressed in centre; base concave in centre; smooth. 
16. T. Ambigua. (Ambiguous Terebratula.) Pentagonal; base undulated; beak produced, with circular aperture; smaller valve, with two 
longitudinal ridges; smooth. 
17, 18. T. Antiquata. (Ancient Terebratula.) Oblong-oval; beak prominent; hinge-line parallel; base rounded, upper valve plain, with 
two divergent ribs from combs; lower valve convex ; smooth. 
19, 20. T. Pentahedra. (Pentagonal Terebratula .) Pentagonal, compressed; beak large, perforation minute ; front and sides emarginate ; 
surface undulated. 
21, 22. T. Decussata. (Decussated Terebratula.) Obovate, gibbose ; base triangular; larger valve plicated, with shallow groove between 
ridges ; smaller valve convex; with longitudinal and transverse stria) and blunt spines. 
23, 24. T. LentiformiS. (Lens-shaped Terebratula.) Orbicular, lenticular ; beak small, perforation minute; smooth. 
25,26. T. Fimbria. (Fringed Terebratula.) Orbicular, gibbose; beak rounded; perforation round; margin, with undulating plaits; disc 
of valves inflated. 
27, 28. T. Punctata. (Punctured Terebratula.) Oblong-ovate, sub-compressed ; valves convex ; margin, straight at base; with fine punctures. 
29, 30. T. Rhomboidea. (Rhomboidal Terebratula.) Sub-rhomboidal; beak large, rounded ; perforation minute, with lateral plaits. 
31. T. Sacculus. (Little Bag Terebratula.) V . Plate LIV.*, Figs. 47, 48, 49. 
32. T. Lineolata. (Lined Terebratula.) Sub-quadrate; beak produced; incurved; sides rounded; base, with central projection; with 
divergent striie. 
33. T. Canalis. (Canalled Terebratula.) Elongated, elliptical, smooth ; beak incurved; with narrow, longitudinal sulcus; base emarginate. 
Length, £ in.; breadth, J in. 
34. 35. T. Ovata. (Ovate Terebratula.) Ovate, compressed ; smaller valve pentangular, sub-depressed ; beak produced; smooth. 
36, 37. T. Sphseroidalis. (Spheroidal Terebratula.) Spheroidal, compressed; beak produced, incurved; edges of valves even ; smooth. 
38, 39. T. Rhomboidea. (Rhomboidal Terebratula.) V. Figs. 29, 30. 
40,41. T. Subrotunda. (Sub-rotund Terebratula.) Circular, compressed ; valves convex; beak short, curved ; smooth. 
42. T. Quadrata. (Square-shaped Terebratula.) Oblong-ovate, gibbose; beak largo; base parallel; both valves, with eight or nine 
longitudinal ribs, 
43. T. Obovata. (Obovate Terebratula.) Obovate; sides rounded ; sub-depressed ; margin flat; base parallel, with two plaits ; beak produced. 
44. 45. T. Seminula. (Little Seed Terebratula.) V. Figs. 6, 7. 
16, 47. T. Rostrata. (Beaked Terebratula.) Sub-orbicular; beak large, projecting, incurved, acute; with nearly thirty rounded plaits; 
front elevated. 
48. T. Angulata. (Cornered Terebratula.) Oblong, compressed ; beak small, incurved; with seven or eight angular, flat-sided plaits, and 
deep sulci; base deeply indented. 
49. T. Pugnus. (Fist-like Terebratula.) Obovate, deltoidal, compressed; beak short, straight ; sides of valves convex, with plaits on edges ; 
base elevated, with four to six obtuse plaits in centre of sinus ; striated. 
50,51. T. Convexa* (Convex Terebratula.) Sub-triangular, sacculiform; beak large, produced, incurved; angles rounded; valves convex; 
front elevated ; with many, divergent ribs. 
52. T. Proava. (Great Grandfather Terebratula.) Oblong; larger valve, with beak produced; with square, mesial fold; valves, with many, 
radiating ribs. 
53, 54. T. Oblonga. (Oblong Terebratula.) Oblong, gibbose ; beak large, curved; with about sixteen forked plaits ; hinge-line broad; front even. 
55. T. Concinna. (Neat Terebratula.) Globose ; beak projecting, acute; centre, with seven plates and about twelve sharp plaits. 
56, 57. T. Psittacus. (Parrot-beaked Terebratula.) Convex, globose ; beaks produced, curved ; sides, with a few longitudinal stria); front 
margin indented, with five longitudinal striie ; j>erforation sub-triangular. 
58,69. T. Orbicularis. (Orbicular Terebratula.) Convex; smaller valve orbicular; larger one, with incurved beak; minutely punctated, 
with about fifteen plaits. 
60. T. Triplicata. (Three-plaited Terebratula.) Transversely elongated; inflated; beak short, obtuse; upper valve convex, with three 
longitudinal folds; under valve concave, with three plaits. 
01,62. T. Annularis. (Binged Terebratula.) Sub-triangular; hinge-line straight; beak short; with broad, longitudinal sulcus in larger 
valve ; with many striie. 
63, 64. T. Flabellulum. (Fan Terebratula .) Depressed; beak straight, rectangular ; smaller valve transversely obovate; with about 
sixteen rounded plaits. 
65. T. Tumida. (Tumid Terebratula.) Obovate, tumid ; lower valve flatter than upper ; with longitudinal ribs. 
66,67, 68,69,70, 71,72,73, 74. T. Acuminata. ( Acuminated Terebratula.) Cordiform, gibbose; beaks minute; one valve, with deep, 
central sinus; the other elevated ; with many, divergent striie. 
75, 76. T. Elegans. (Elegant Terebratula.) Transversely obovate ; beak prominent, acute, straight; front elevated, straight; with many, 
narrow ribs. J 
77, 78. T. Comta. (Elegant Terebratula.) Oblong, convex, pentahedral; beak long, straight; with many ribs; front elevated. 
79, 80. T. Martini. (Martin's Terebratula.) Sub-orbicular; thick, compressed; beak small, incurved ; with many, simple plaits ; base elevated. 
81, 82. T. Deflexa. (Bending Terebratula.) Transversely obovate, gibbose; lower valve, with sinus; beaks small, adpressed; with about 
twenty-four plaits. Length, $ in.; breadth, $ in.; depth, J in. 
83,84. T. Parvirostris. (Short-beaked Terebratula.) Tetrahedral, orbicular; beak small, acute; sides angular, produced; with many, 
divergent ribs. 
85. T. Tetrahedra. (Four-sided Terebratula.) Obtusely deltoidal, gibbose; tetrahedral; beaks incurved; front, with four or five sharp 
plaits on each side from beak to sides. 
86,87. T. Sphaerica. (Spherical Terebratula.) Orbicular, ventricose; beaks equal; with about fourteen obtuse, forked plaits ; sides concave. 
Diameter, £ in. 
88. T. Decemplicata. (Ten-plaited Terebratula.) Globular; beaks small, acute ; with ten plaits. Length and breadth, J in. 
89. T. Imbricata. (Imbricated Terebratula.) Transversely obovate, trilobate; with many, bifurcated and trifurcated plaits, crossed by 
imbricating scales; base elevated. Diameter, # in. 
90,91. T. Wilsoni. (Wilson's Terebratula.) Circular, plaited; valves, compressed near beaks; base cylindrical; margin acutely dentated, 
with nine or ten plaits on each side; front sinus deep. 
92, 93, 94. T. Cordiformis. (Heart-shaped Terebratula.) Cordiform ; front elevated ; with deep, marginal sinus; sides convex, with sharp 
edges centre, with acute, angular sulci, from beaks to base; size variable. 
95. T. Bidens. (Two-toothcd Terebratula.) Sub-orbicular; beaks small; upper valve convex, lower one concave; each with two, central 
plaits, with two, tooth-like plaits in the sides. 
96, 97. T. Crumena. (Pocket-shaped Terebratula.) Deltoidal, gibbose ; beak prominent; front, with three plaits from beak ; sides, with four 
or more plaits below centre. 
98,99. T. Acuta-plicata. ( Acute-plaited Terebratula.) Transversely elongated; pocket-shaped; gibbose; beak produced, small, curved; 
front elevated, with six plaits; surface, with many, sharp plaits. 
100. T. Megatrema. (Largely-perforated Terebratula.) Transversely obovate, convex ; beak large, produced, with ample perforation ; with 
a few, large, divergent ribs. 
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