Terebratula. 
MOLLUSCA. 
133 
16. Terebratula Sowerbii —Sowerby’s Terebratula, pi. 
LII. fig. 35, 36. 
T. biplicata. Sowerby V. p. 53, pi. 437, fig. 2, 3. 
Oblong-ovoid, inflated; both valves equally convex; beak 
obtuse, very little incurved; sides straight, and obtuse; base a 
little hollowed; smaller valve with two large, flat, rounded 
plaits, gently merging into a flat furrow on both sides; surface 
very smooth. 
Upper Greensand, Cambridgeshire. 
17. Terebratula elongata. —The Elongated Terebra¬ 
tula, pi. LII. fig. 33, 34. 
T. elongata. Sowerby, V. p. 49, pi. 435, fig. 1. 
Oval; valves equally, regularly, and moderately convex; 
beak small, acute, and slightly incurved; surface smooth. 
Distinguished from T. carnea by its length. 
Lower Greensand, Court-at-Strect, and the Chalk at Norwich. 
18. Terebratula carnea. —The Flesh-coloured Tere¬ 
bratula, pi. LIV.* fig. 30, 31, 32, 33. 
T. carnea . Sowerby, I. p. 45, pi. 15, fig. 5. Brongniart, 
Env. de Paris, pi. 4, fig. 9. 
Subrotund, obtusely pentangular, depressed; valves equally 
convex, slightly flattened along the middle, smooth; beak small, 
flat; base flat, and short; sides plain. Diameter one inch. 
The Upper Chalk, near Norwich, contains specimens of a 
fine flesh-colour; also at Warminster, Devizes; Northflcet, 
Lewis, and Yorkshire. 
19. Terebratula Sacculus —The Little Bag Terebra¬ 
tula, pi. LII. fig. 39, 40, and pi. LV.* fig. 31. 
T. Sacculus. Sowerby, V. p. 65, pi. 446, fig. 1. Phillips, Geo. 
York. II. p. 221, pi. 12, fig.2. Ib. Pal. Fos. p.9L pi. 35, fig. 166. 
Anomites Sacculus, Martin, Pet. Derb. pi. 46, fig. 1, 2. 
Obovate, gibbose; with a broad and deep central furrow, 
which divides the larger valve into two lobes; the smaller valve 
has also a shallow space near the edge, from whence proceeds 
an elevation, emanating from a minute sinus in the edge; beak 
small, and sharp. 
Carboniferous Limestone, Limerick, Dublin; Bolland, Bristol, 
Rutherglen, and Orton. 
20. Terebratula lata. — The Broad Terebratula, pi. 
LIV.* fig. 14. 
T. lata. Sowerby, I. p. 227, pi. 100, lower figure. 
Suborbicular, smooth, subdepressed; length and width of 
smaller valve about equal; larger valve subcarinated; beak pro¬ 
minent, and nearly straight; base rounded. 
Inferior Oolite, Cheltenham. 
21. Terebratula ovoides. —The Oval Terebratula, pi. 
LIV* fig. 34. 
T. ovoides. Sowerby, I. p. 227, pi. 100, upper figure. 
Oblong-ovate, smooth; beak produced; larger valve gibbous, 
and subcarinated; lesser valve convex; base a little produced; 
sides obtusely angled, at about a third from the beak. Length 
a half more than its width. 
Calcareous Grit, Suifolk, Scarborough, and Gristhorpe. 
22. Terebratula trilineata —The Three-lined Tere¬ 
bratula, pi. LIV.* fig. 15. 
T. oi'nithocephala. Young and Bird, p. 229? pi. 8, fig. 14. 
Ovate-rhomboidal, subdepressed; margin very faintly undu¬ 
lated ; both valves with two or three striae; beak moderately 
convex, and nearly straight; base slightly produced. 
Inferior Oolite, Glazdalc and Coldmoor; Lias, Whitby. 
23. Terebratula variabilis —The Variable Terebratula, 
pi. LIV* fig. 19, 20, 21, 22. 
T. variabilis. Sowerby, VI. p. 148, pi. 576, fig. 2, 3, 4, 5. 
Oblong, or suborbicular, rather convex, and smooth; beak 
considerably produced, and truncated, with the perforation 
round, large, straight, and truncated; internal area with a large 
sinus. 
Common in the Red Crag, Sutton; and the Coralline Crag, 
Ramshot. 
24. Terebratula obesa. —The Swollen Terebratula, pi. 
LIV * fig. 28, 29. 
T. obesa. Sowerby, V. p. 54, pi. 438, fig. 1. 
Ovate, globose; both valves regularly convex, their width 
and depth equal to about two-thirds of the length of the shell; 
larger valve regularly convex to the margin; beak short, very 
obtuse, and incurved; base rather obtuse, and elevated, with a 
shallow, broad sinus in the middle; smaller valve somewhat 
depressed on each side of the produced base, and also near 
the edge into the central sinus. 
Gault, Cambridgeshire. 
25. Terebratula intermedia —The Intermediate Tere¬ 
bratula, pi. LIV.* fig. 35. 
T. intermedia. Sowerby, I. p. 48, pi. 15, fig. 8. 
Obscurely-pentangular, somewhat depressed, smooth; larger 
valve with two depressions, and more convex than the smaller 
one, which has three depressions; base with moderately deep 
undulations, which extend half way along the valves, from which 
they are regularly convex. 
Coral Rag, Malton; the Calcareous Grit, Castle Howard; 
and the Great Oolite, Weston. 
26. Terebratula subundata. —The Half-waved Tere¬ 
bratula, pi. LIV.* fig. 43, 44. 
T. subundata. Sowerby, I. p. 47, pi. 15, fig. 7. Phillips, 
Geo. York. I. p. 94, pi. 2, fig. 25, 26. 
Nearly circular, rather depressed, smooth; valves equally 
convex; base straight, or slightly depressed in the centre, with 
a single undulation on each side of if. 
o 
Upper and Lower Chalk, Norfolk and Suifolk; Danes Dyke 
and Speeton, Yorkshire. 
27- Terebratula resupinata. —The Back-lying Tere¬ 
bratula, pi. LIV* fig. 41, 42. 
T. resupinata. Sowerby, II. p. 116, pi. 150, fig. 3, 4. Phil¬ 
lips, Geo. York. I. p. 134, pi. 13, fig. 23. 
Oblong-ovate; beak small, slightly incurved; lower valve ob¬ 
tusely carinated; base depressed by a large plait, rounded in the 
middle ; sides elevated ; lower valve with an obtuse, broad and 
rounded keel, and a longitudinal ridge on each side. 
Inferior Oolite, Ilminster, and the Lias, Wilton Castle. 
28. Terebratula semiglobosa — The Nearly-globular 
Terebratula, pi. LIV.* fig. 45, 46. 
T. semiglobosa. Sowerby, I. p. 48, pi. 15, fig. 9* Brongni¬ 
art, Env. de Paris, pi. 9, fig. L 
Nearly globular, very much inflated, smooth; larger valve 
deepest, and uniformly gibbous; smaller valve with two slight 
elevations; base undulated. 
Upper Greensand, Warminster and Tetsworth ; and Upper 
Chalk, Danes Dyke. 
