132 
3. Terebratula Kleinii. —Kline’s Terebratula, pi. LII. 
fig. 1 7. 1 8. 
T. globata. Sowerby, V. pi. 436, fig. 1. 
Subglobular; both valves considerably inflated ; umbo small, 
and incurvated; lesser valve with a double sinus, for the recep¬ 
tion of the elevated front of the other, and with slightly pro¬ 
duced ridges, extending a little way towards the centre, which 
is provided with obtuse angles, and hardly any furrows from the 
sinuses; surface covered with minute punctures. 
Fullers’ Earth at Nanney, near Fromc, and the Inferior 
Oolite at Cotswold Hills. 
4. Terebratula perovalis —The Somewhat Oval Tere¬ 
bratula, pi. LII. fig. 16, 16. 
T. perovalis. Sowerby, V. p. 54, pi. 436, fig. 2, 3. 
Subovate; both valves equally convex; smooth; beak in¬ 
curved, and acute; margin obtuse; base with two elevated 
sinuses, and an intervening depression; these sinuses produce 
three very obtuse ridges, two in the upper and one in front of 
the lower valve. 
Distinguished from T. biplicata by its regular oval form and rather 
acute beak. 
Inferior Oolite, Dundry and Cotswold Hill. 
5. Terebratula maxillata —The Combe Terebratula, 
pi. LII. fig. 29, 30. 
T. maxillata. Sowerby, V. p. 52, pi. 436, fig. 4. 
Subquadrangular, rather convex; umbo large, and consider¬ 
ably incurvated; base with two acutely elevated sinuses, and 
one obtuse sinus on each side; upper valve with three well- 
marked furrows, extending half way to the beak, and two in the 
low f er; base rounded. 
Distinguished from T. intermedia by the depth of the sinuses. 
Great Oolite, Stonesfield; and Inferior Oolite, Nanney. 
6. Terebratula emarginata —The Emarginate Tere¬ 
bratula, pi. LII. fig. 22, 23. 
T. emarginata . Sowerby, V. p. 50, pi. 435, fig. 5. 
Subrhomboidal; the larger valve convex; the smaller one 
nearly flat; base emarginate, or having two angles; the edge 
becomes blunt when old. 
Inferior Oolite at Nunney and Cotswold Hills. 
7. Terebratula L/Eviuscula. —The Very Smooth Tere¬ 
bratula, pi. LVI.* fig. 5. 
T. Iceviuscula. Sowerby, Sil. Syst. p. 631, pi. 13, fig. 14. 
Somewhat rhomboidal, a little convex, and smooth; base 
rounded ; sides angular. Diameter three lines. 
Wenlock Shale, Tynewidd and Llandovery. 
8. Terebratula canalis —The Canaled Terebratula, pi. 
LV * fig. 33. 
T. canalis. Sowerby, Sil. Syst. p. 611, pi. 5, fig. 18. 
Elongated, elliptical, smooth ; beak slightly incurved ; a nar¬ 
row, longitudinal, central furrow; base emarginate. Length 
half an inch; width four lines and a half. 
Lower Ludlow Rocks, near Usk. 
9. Terebratula navicula. —The Little Ship Terebra- 
tida, pi. LIV.* fig. 39, 10. 
T. navicula. Sowerby, Sil. Syst. p. 611 and 615, pi. 5, fig. 17. 
Oblong, boat-shaped, smooth; beak short, incurved; upper 
valve almost flat, with its sides elevated and its base depressed; 
lower valve with an obtuse keel. Length 7 lines; width 5 lines. 
Upper Ludlow Rock, Ludlow promontory; Clyro Hills, Rad¬ 
norshire, and several places in Brecon, Yeo Edge, &c. 
Terebratula. 
10. Terebratula triquetra. —The Triangular Terebra¬ 
tula, pi. LII. fig. 14 and 21. 
T. triquetra. Sowerby, V. p. 65, pi. 445, fig. 1. 
Suborbicular; valves equally convex; beak produced, in¬ 
curved, and obtusely keel-shaped ; with a carina on each side; 
perforation triangular; base a little indented, producing a slight 
concavity on the surface; upper valve of equal length and 
breadth, its edge level and sharp; surface very smooth. 
Great Oolite, Felmersham, Bedfordshire. 
11. Terebratula bullata. —The Swelled Terebratula. 
pi. LII. fig-25, 26. 
T. bullata. Sowerby, V. p. 49, pi. 435, fig. 4. 
Orbicular, very ventricose, depth greater than its width; 
beak considerably produced, and incurved; base indented, from 
which an obscure furrow ascends a little way upwards; edges 
regularly level; surface minutely punctated, which, however, is 
only observable by the aid of a strong lens. 
Distinguished from the inflated variety of T. dig on a by its base being 
narrow. 
Coral Rag, Nunney; the Cornbrach, Atford; the Fullers’ 
Earth, Cold Ashton. 
12. Terebratula obtusa —The Obtuse Terebratula, pi. 
LII. fig. 27, 28. 
T. obtusa. Sowerby, V. p. 53, pi. 437, fig. 4. 
Suborbicular, somewhat depressed; lesser valve a little wider 
than long; surface of both valves equally and regularly convex, 
except near the edges, where they are abruptly bent, and form 
a rather square, obtuse margin ; base broad, and elevated. 
Gault, Cambridgeshire. 
13. Terebratula bucculenta —The Full-cheeked Tere¬ 
bratula, pi. LII. fig. 37, 38. 
T. bucculenta. Sowerby, V. p. 54, pi. 438, fig. 2. 
Somewhat square; valves nearly equal; very convex; beak 
short, incurved; sides convex; edges nearly level, and not 
sinuated; base considerably produced, and truncated. 
Some authors think this a variety of T. bullata , but I am of a dif¬ 
ferent opinion, judging from a series of specimens. 
Coral Rag, Malton. 
14. Terebratula Sella. —The Saddle-formed Terebra¬ 
tula, pi. LII. fig. 31, 32. 
T. Sella. Sowerby, V. p. 53, pi. 437, fig. 1. 
Subquadrangular, or trigonal, convex; length and breadth 
nearly equal; beak obtuse, slightly curved; sides compressed, 
and a little rounded; base considerably elevated, and narrow; a 
depression in its centre, from whence it becomes suddenly pro¬ 
duced, and occasions a hollow on each side. 
Lower Greensand, Maidstone, and Chart, near Ashford, Kent. 
15. Terebratula biplicata —The Two-plaited Tere¬ 
bratula, pi. LIV.* fig. 25. 
T. biplicata. Sowerby, I. p. 201, pi. 90. 
Oblong, gibbosc; beak large, prominent, very slightly in¬ 
curved ; sides rounded; base rather parallel, from which ema¬ 
nate in the lower valve two large, distant, well defined plaits or 
obtuse ribs, ascending two-thirds the length of the valve. 
In the young condition the plaits are hardly visible. 
This species is common to various beds, as the Lower Chalk, 
Warminster; the Upper Greensand, Shute Farm, Cambridge¬ 
shire, and Lyme; the Gualt, Folkstone; Lower Greensand, 
Kent; and the Red Chalk, Hunstanton, Blackdovvn. 
MOLLUSCA. 
