200 
CONCHIFERA. 
CaRDR’M. 
surrounded by numerous large, channelled, conical spines, with 
two series of lesser ones between each. 
Greensand, Blackdown, Devonshire. 
10. Cardium semt-ghanulatum.—T he Semi-granulated 
Cardium, pi. LXXXII. fig. 21. 
C. semi-granulatum. Sowerby, II. p. 90, pi. 114. 
Gibbose, transverse, sub-triangular; shell smooth ; slender ; 
posterior side nearly straight, longitudinally sulcated, and with 
largo granulations; general surface with fine longitudinal 
striae, which upon the anterior side become enlarged, and as¬ 
sume the form of sharp sulci; the intervening ridges furnished 
with numerous small, irregular, globose granules; marginal 
edge minutely dentated. 
London Clay, Barton Cliff and Wandsworth. 
11. Cardium striatulum. —The Small-striated Cardium, 
pi. LXXXI. fig. 27. 
C. striatulum. Sowerby, YI. p. 101, pi. 553, fig. 1. Phil¬ 
lips, Geo. York, I. pi. 11, fig. 7. 
Convex, orbicular; posterior sido longitudinally striated, 
and ending in a toothed margin ; general surface concentrically 
and irregularly striated. 
The shell strongly resembles C Hillanum, but is more perfectly orbi¬ 
cular, the transverse strife less regular, and the longitudinal ones doubly 
numerous. 
12. Cardium dissimile. —The Dissimilar Cardium, pi. 
LXXXI I. fig. 22. 
C. dissimile . Sowerby, YI. p. 101, pi. 553, fig. 2. 
Gibbose, transversely obovato; its length a trillo less than 
its breadth ; smooth ; shell thick, except near the beaks; pos¬ 
terior sido bounded by a small rib, and longitudinally striated ; 
front rather straight. 
The Lower Greensand, Sandgate, and the Portland Sand, 
Tisbury, Swindon, See. 
13. Cardium turgidum. —The Swollen Cardium, pi. 
LXXXII. fig. 2. 
(7. truncatum . Sowerby, IY. p. 63, pi. 346, fig. 1. 
Gibbose, obovate, slightly transverse, smooth ; anterior side 
a little truncated, with from twenty to thirty longitudinal fur¬ 
rows, and with fino, nearly obsolete strife ; margins bluntly 
toothed. 
The London Clay, Barton, Hampshire. 
14. Cardium truncatum.—T he Truncated Cardium, pi. 
LXXXI. fig. 25. 
C. truncatum. Sowerby, YI. p. 102, pi. 553, fig. 3. Phil¬ 
lips, Geo. York, I. pi. 13, fig. 14. 
Gibbose, transversely ovate, its length nearly equal to its 
width ; smooth ; posterior side obliquely truncated, and longi¬ 
tudinally striated, the interstices between which, towards the 
beaks, are a little scabrous ; beaks small. 
Dio Lias, Yorkshire, Cotswold Hill, and Brambury Hill. 
15. Cardium porulosum.— 1 The Porous Cardium, pi. 
LXXXI. fig. 16. 
C. porulosum. Sowerby, IY. p. 64, pi. 347, fig. 2. 
Nearly orbicular; right side a very little truncated; sur¬ 
face with many longitudinal deep furrows ; on the intervening 
fiat, smooth spaces, a series of erect, sub-acute, approximating 
spines, which are united a great part of their length by thin 
lamina), projecting from their sides, their bases and points being 
free ; margin deeply denticulated all round ; hinge-line straight. 
The London Clay, Barton, and Bracklesham. 
16. Cardium globosum. —The Globular Cardium, pi. 
LXXXI. fig. 16. 
C. globosum. Beau. Mag. Nat. Hist. New Ser. III. p. 60, 
fig. 19. 
Nearly orbicular, inflated; surface smooth, with many fine 
concentric strife; posterior sido somewhat flattened for a 
little way below the beaks. 
The London Clay, Barton. 
17. Cardium aculeatum. —The Prickly Cardium, pi. 
LXXXI. fig. 17. 
C. aculeatum. Pennant, Brit. Zool. IV. p. 90, pi. 1, f. 37. 
Elongated, oblique ; anteriorly short; posteriorly long, and 
somewhat truncated; surface with many longitudinal, trian¬ 
gular, largo ribs, which extend beyond the margins, armed 
with a series of sharp, curved, regular spines along their 
centre; furrows striated transversely. 
The Pleistocene Marine Formation, Stevenston, Ayrshire. 
18 . Cardium eciiinatum.— The Spined Cardium, pi. 
LXXXL fig. 23. 
C. echinatum. Donovan, Brit. Sp. pi. 107, fig. 1. 
Convex, and nearly orbicular, with about eighteen irregular 
raised ribs, armed with a row of numerous inflected spines 
along their centre; the intervening furrows striated transversely. 
This shell is rounder and not so oblique as the last. 
Tho Pleistocene Marine Formation, Largs, Frith of Clyde, 
and Ireland. 
19. Cardium acutangulum. —The Acute-angled Cardium, 
pi. LXXXI. fig. 24. 
C. acutangulum. Phillips, Geo. York, I. pi. 11, fig. 6. 
Sub-triangular ; anterior sido rounded ; posterior side flat¬ 
tened ; obliquely truncated, defined by a ridge emanating from 
the beak, and terminating in an acute angle on the margin; 
surface smooth. 
The Great Oolite, Brandsby, Yorkshire, and the Inferior 
Oolite, Glaizedale. 
20 . Cardium edule. —The Edible Cardium, pi. LXXXII. 
figs. 4 and ] 6. 
C. edule. Pennant, Brit. Zool. IV. p. 91, pi. 50, fig. 41. 
Somewhat globose, with from twenty-four to twenty-six 
rounded, longitudinal ribs, crossed by transverse, scale-like 
protuberances, separated by very narrow furrows. 
The Mammiferous Crag, Bramorton, and tho Red Crag, 
Sutton. 
21. Cardium gibberulum. —The Inflated Cardium, pi. 
LXXXII. fig. 1. 
C. gibberulum. Phillips, Geo. York, I. pi. 11, fig. 8. 
Sub-triangular, inflated; anteriorly rounded ; posteriorly 
sub-truncated above; surface smooth, crossed by remote and 
equidistant lines of growth. 
The Inferior Oolite, Yorkshire. 
22. Cardium citrinoideum. —The Citron-like Cardium, 
pi. LXXXI I. fig. 20. 
C. citrinoideum. Phillips, Geo. York, 1. pi. 7, fig. 7. 
Oblong-ovate ; beaks large; hinge-lino straight; short; sides 
gently rounded ; baso arcuated ; surfaco smooth and shining. 
Tho Cornbrash, Scarborough. 
23. Cardium lobatum.— The Lobed Cardium, pi. LXXIJ. 
fig. 26. 
