CONCHIFERA. 
CORBULA. 
999 
C. longirostrum . Deshayes, Coq. Foss. p. 52, pi. 7, figs. 20, 
21. Tellina cuspidate (?) Olivi, Zoologia Adriatica, p. 101, 
pi. 4, fig. 3. 
Shell transversely ovate, with thin concentric stria) ; a long 
beak in front; umbones very small. 
Found in the London Clay at Bracklesham. 
3. Corbula striata. —Striated Corbula, pi. XCI. fig. 15. 
C. striata. Lamarck, Ann. du Mus. VIII. p. 4G7, No. 3. 
Ib. An. San. Ver. V. p. 407, No. 13. 
Shell transversely oval, with a short beak; surface covered 
with numerous fine, thin, transverse strife. 
Found in the London Clay at Bracklesham and Barton. 
4. Corbula umbonella.—T he Little Shield Corbula, pi. 
XCI. fig. 89. 
C. umbonella. Deshayes, Coq. Fos. p. 52, pi. 7, figs. 18, 10. 
Shell transversely ovate, thick, and globose, with a short 
beak in front; umbones largo, recurved, and prominent; sur¬ 
face with strong scaleriform striae. 
Found in the London Clay at Bracklesham. 
5. Corbula gig an tea.—G igantic Corbula, pi. XCI. f. 38. 
C. gigantea. Sowerby, III. p. 13, pi. 209, figs. 5, G, 7. 
Gibboso, transversely oblong; anterior side produced and 
recurved; posterior and part of the front sido furnished with 
short spines, placed in longitudinal rows; surface concentric¬ 
ally furrowed near the beaks ; this side very concave, and 
separated by an obscure ridge. 
Young shells gibbose, with very equal ribs between furrows, being 
broadest in the middle, and narrowing towards the sides. 
The Greensand, Hants and Blackdown. 
G. Corbula olobosa.—G lobular Corbula, pi. XCI. fig. 19. 
C. globosa. Sowerby, III. p. 14, pi. 209, fig. 3. 
Globular, smooth ; its thickuess equal to its length ; ante¬ 
rior side of the larger valve produced into a lip, and obtuse in 
front; posterior side round, and the front obtuse ; beaks equal. 
London Clay, Ilighgato and Wandsworth. 
7. Corbula elegans.—T he Elegant Corbula, pi. XCI. 
figs. 23, 24. 
C. elegans. Sowerby, VI. p. 139, pi. 572, fig. 1. 
Sub-globular; right valve moro convex than the left; con¬ 
centrically sulcated ; posterior side somewhat produced, smooth, 
and truncated ; left valve sub-triangular, smooth; the beak 
of the sulcated valve is somewhat curved, and destitute of 
a beak. 
Greensand, Blackdown. 
8. Corbula striatula.—'T he Minutely Striated Corbula, 
pi. XCI. figs. 21, 22. 
C. striatula. Sowerby, VI. p. 139, pi. 572, figs. 2, 3. 
Slightly ovate, ventricose; valves nearly equal; minutely 
striated ; beak long, straight, and doubly channeled internally. 
In the Gault, Folkstone. 
9. Corbula rotundata.—T he Rounded Corbula, pL XCI. 
fig. 31. 
C. rotundata. Sowerby, VI. p. 140, pi. 572, fig. 4. 
Gibbose, ovate, sides nearly equal, the posterior oneslightlv 
truncated; beaks produced; concentrically furrowed; sides 
nearly equal. 
The Red Crag, Sutton; Pleistocene Marine, Ayr and 
Forth ; and Norwich Crag, Bramerton. 
10. Corbula obscura.—O bscure Corbula, pi. XCI. f. 25. 
C. obscura. Geo. Tr. 2d Ser. II. p. 320. Sowerby, VI. 
p. 140, pi. 572, fig. 5. 
Gibbose, ovate, smooth ; posterior side flattened. 
Inferior Oolite, Brora, Sutherlandshire. 
11. Corbula nitida. —Shining Corbula, pi. XCI. fig. 29. 
C. nitida. Sowerby, IV. p. 85, pi. 3G2, figs. 1, 2, 3. 
Gibbose, ovate, sub-trigonal, equilateral; anterior side 
truncated, smooth, and shining; valves nearly equal; beak 
produced and rather inflated. 
This species hardly exceeds three-tenths of an inch. 
Upper Marl, Isle of Wight. 
12. Corbula cuspidata. —'The Fointed Corbula, pi. XCI. 
figs. 13, 14. 
C. cuspidata. Sowerby, IV. p. 85, pi. 3G2, figs. 4, 5, G. 
Tumid, transversely oblong, sub-equilateral; anterior side 
carinated and pointed ; lower margin of left valve expanded 
and inflated, bending over the margin of the opposite valve ; 
disk somewhat rugged; length not quite two-eighths of an 
inch; breadth two and a-half eighths. 
Upper Marl, Colwell and Whitecliff Bay. 
13. Corbula complanata.— The Flattened Corbula, pi. 
XCI. fig. 30. 
C. complanata. Sowerby, p. 8G, pi. 3G2, figs. 7, 8. 
Depressed, transversely ovate, elongated, its length about 
half its width ; anterior side smaller than the posterior ; sub- 
truncated, and defined by an obtuse ridge; posterior portion 
of the right valve exceedingly depressed and thickened ; sur¬ 
face with seven or eight transverse furrows, the interstices be¬ 
ing smooth; left valve most convex, and enveloping the 
right. 
Red Crag, Sutton. 
14. Corbula pisum.— The Pea-shaped Corbula, pi. XCI. 
fig. 20. 
C. pisum. Sowerby, III. p. 15, pi. 209, fig. 4. 
Sub-globular; anterior side slightly truncated ; margin of 
one valve produced; beaks unequal, that of the larger valve 
very prominent and ventricose; surfaco concentrically fur¬ 
rowed ; margin extending beyond the anterior side of the larger 
valve and a portion of the front. 
The London Clay, Barton. 
15. Corbula revoluta.— The Revolved Corbula, pi. XCI. 
figs, lfi, 17, 18. 
C. revoluta . Sowerby, III. 1G, pi. 209, figs. 8, 9, 10. 
Tumid, transversely oblong, its width double its length ; 
anterior side produced and truncated, with a keel running to 
the beak ; margin of larger valvo prominent and inflected; 
beaks unequal; transversely furrowed; larger valve envelop¬ 
ing the edge of the lesser one, and with tho front expanding, 
and revolving inwards. 
Tho London Clay, Barton, and Herne Bay. 
A variety of this species has fewer and deeper furrows, with the ante¬ 
rior side somewhat pointed. 
IG. Corbula curtansata.— The Shortened Corbula, pi 
XCI. fig. 4. 
C. curtansata . Phillips, Geo. York, I. pi. 3, fig. 27. 
1 ransverse; autorior side large and rounded; posteriorly 
acuminated; beaks almost central; surfaco smooth, with well- 
marked lines of growth ; basal lino triangular. 
Tho Coral Rag, Malton, and South Cave, Yorkshire. 
