370 
MOLLUSCA. ACEPHALA. Terebratula. 
subcarinated ; lesser valve convex — Sower. Min. Conch, t. c. ; upper figure — 
In Green Sand. 
11. T. lata Orbicular, depressed; beak prominent; larger valve subcari- 
nated at the back — Sower. Min. Conch, t. xc. ; lower figure. — In Green Sand. 
12. T. ornithocephala. — Ovato-rhomboidal ; depressed when young; elon- 
gated and gibbous when old ; front straight, bounded by two obtuse lateral 
depressions, similar in each valve — Sower. Min. Conch, t. ci. f. 1, 2, 4. — In 
Lias. 
13. T. lampas Ovato-rhomboidal gibbous ; front straight, produced, lesser 
valve depressed. — Sower. Min. Conch, t. ci. f. 3. — In Lias^ at Lyme. 
14. T. ohovata — -Obovate, transverse, gibbous, fiattish; beak prominent; 
front straightish, bounded by two obsolete plaits. — Sower. Min. Conch, t. ci. 
f. 5. — In Lias. 
1 5. T. retorquata. — Oblong, ovate, front depressed by a large rounded plait ; 
sides elevated, rounded ; lower valve obtusely carinated, with a sharp beak, 
and a longitudinal ridge along each side — T. resupinata. Sower. Min. Conch, 
t. cl. f. 3, 4. — Inferior Oolite. 
16. T. coarctata. — Subheptagonal, gibbose, hispid, and decussated ; lesser 
valve convex, subtrilobated ; larger valve biplicated, with a deep angular 
sulcus between the plaits — Parle. Org. Rem. iii. 229. t. xvi. f. 5. Sower. Min. 
Conch. 312. f. 1, L-^Oolite. 
17. reticulata. — Obovate, gibbose, subhispid, decussated; front obscurely 
three-sided ; lesser valve convex ; larger valve obtusely biplicated, with a 
shallow channel between the ridges. — Sower. Min. Conch, t. ceexii. — Oolite. 
18. T. acuminata. — Heart-shaped; front much elevated, with a deep acute 
angular sinus in the margin ; surface finely striated — Mart. Derb. t. xxxii, 
xxxiii. f. 5, 8. Sower. Min. Conch, t. cccxxiv. and t. ccccxcv— In Carboni- 
ferous Limestone. 
19. T. affinis. — Orbicular, strongly striated ; upper valve gibbose, with an 
elevated sinus in the front ; lower valve nearly flat.— 5'ower. Min. Conch, 
t. cccxxiv. f. 2. — In Carboniferous Limestone. 
20. T. Transversely ovate, longitudinally striated; striae mi- 
nute, numerous, and equal ; imperforate valve most convex ; perforation tri- 
angular.— Derb. t. xlix. f. 13, 14. — Sower. Min. Conch, t. cccxxv.— In 
Carboniferous Limestone. 
21. H.lineata — Transversely oval, gibbose; minutely striated longitudi- 
nally, and transversely sulcated ; sulci distant. Mart. Derb. xxxvi. f. 3. — Sower. 
Min. Conch, t. cccxxxv. f. 1, 2 Carboniferous Limestone. 
22. T. imbricata — Transversely oval, gibbose, imbricated, longitudinally 
sulcated ; front slightly elevated ; sulci obsolete.— .Shwer. Min. Conch, t. 
ccccxxxv. f. 3, 4.— In Carboniferous Limestone. 
23. T. elongata. — Oval, convex, smooth ; margin even ; beak incurved. — 
Sower. Min. Conch, t. ccccxxxiv. f. 1, 2. — In Chalk. 
24. T. sphwroidalis. — A depressed spheroid, with a slightly produced beak. 
■ — Sower. Min. Conch, t. ccccxxxv. f. 3. — Oolite. 
25. T. Orbicular, ventricose, with a produced and recurved beak ; 
front indented ; depth greater than width. — Sower. Min. Conch, t. ccccxxxv. 
f. 4. — Upper Oolite. 
26. T. emarginata. — Subrhomboidal ; the lesser valve nearly flat, the other 
