372 
MOLLUSCA. ACEPHALA. Terebratula. 
with three long plaits ; sides with four or more plaits below the middle ; 
beak prominent. — Anomia striata, f/re, Ruth. 313. t. xiv. f. 6. — Ammonites 
crumena, Mart. Derb. t. xxxvi. f. 4 — Ter, erum. Smier. Min. Conch, t. 
Ixxxiii. f. 2, ^.^Carboniferous Limestone. 
42. T. tetro£dra. — Obtusely deltoid, gibbous, plaited ; front elevated in the 
middle, with four or five sharp plaits ; four or miore sharp plaits on each side ; 
beak rather incurved. — Sower. Min. Conch, t. Ixxxiii. f. 4 — In Oolite. 
43. T. media. — Very obtusely deltoid; gibbous, plaited; front rounded, 
with a rising in the middle, composed of six sharp plaits approaching those 
in the. middle ; beak a little incurved,— <S'ower. Min. Conch, t. Ixxxiii. f. 5. — 
In Oolite. 
44. T. concinna — ^Nearly globose; acutely plaited; middle elevated by 
seven plaits ; twelve or more plaits on each side ; beak projecting— 
Min. Conch, t. Ixxxiii. f. 6. — In Oolite. 
45. T. ohsoleta. — Nearly round, gibbous, plaited ; middle of the front a lit- 
tle elevated by seven plaits ; sides having from seven to eleven plaits ; beak 
projecting. — Sower. Min. Conch, t. Ixxxiii. f. 7. In Oolite. 
46. T. plicatilis. Gibbose, transversely obovate, finely and obtusely plait- 
ed.; middle elevated by twelve plaits ; fifteen or more plaits on each side ; 
beak slightly projecting. Sower. Min. Conch, t. cxviii. f. 1. In Chalk. 
47 . T. octoplicata. Gibbose, transversely obovate, obtusely plaited ; middle 
elevated by eight plaits ; twelve or fourteen plaits on each side ; beak pro- 
jecting. Sower. Min. Conch, cxviii. f. 2. In Chalk. 
48. T. Wilsoni. — Circular, plaited ; front cylindrical, margin acutely den- 
tated, elevated in the middle with seven plates, nine or ten plates on each 
side ; valves compressed towards the beaks — Sower. Min. Conch, t. cxviii, 
f. 3.— In Carboniferous Limestone at Mordifbrd, E.S.E. of Hereford. 
49. T. Orbicular, gibbose, plicato-striated, with a flattish space 
extending from the front to the beaks ; beak of the lower valve prominent, 
slightly incurved, back of the upper valve straight, with an incurved beak, — 
Sower. Min. Conch, t. cxxxviii. f 1.— In Green Sand. 
50. T. Lyra. — Oblong, convex, with diverging furcated plaits ; beak of the 
lower valve greatly elongated, with two longitudinal septa, that of the up- 
per valve short, incurved— Min, Conch, t. cxxxviii. f. 2.— In Green 
Sand. 
51. T. acuta — Ovato-triangular, slightly transverse ; middle elevated by 
one large acute angular plait ; sides with one large and several small, plaits 
each. — Sower. Min. Conch, t. cxl. f. 1, 2. — Inferior Oolite. 
52. T. Mantiee. — Depressed, subtrigonous ; with 1 6 angular plaits, half of 
them on one side elevated; upper valve convex. — Sower. Min. Conch, 
t. cclxvii. f. 1. — Carboniferous Limestone, Ireland. 
53. T. obliqua — Depressed, transversely obovate, with 15 angular plaits, 
the 5 central ones obliquely elevated from one side ; beak prominent. — Sower. 
Min. Conch, t, cclxxvii. f. 2 In Chalk. 
54 . T. inconstans — Globose, with about 26 angular plaits, half of them, on 
one side, elevated ; beak incurved. — Sower. Min. Conch, t. cclxxvii. f. 3, 4.— 
Middle Oolite. 
55. T. Transversely obovate, subdepressed, with a projecting 
beak, plaited ; upper valve convex ; plaits about 30, half of which, on one 
side, are elevated.— Nezcen Min. Conch, t, cclxxvii. f. 5. — In Green Sand. 
