200 



CONCHIFERA. 



Cardilm. 



surrounded by numerous large, channelled, conical spines, with 

 two series of lesser ones between each. 

 Greensand, Blackdown, Devonshire. 



10. Cardium semi-granulatum. — The Semi-granulated 

 Cardium, pi. LXXXII. fig. 21. 



C. semi-granulatum. Sowerby, II. p. 99, pi. 14'i. 



Gibbose, transverse, sub-triangular ; shell smooth ; slender ; 

 posterior side nearly straight, longitudinally suicated, and with 

 large granulations ; general surface with fine longitudinal 

 strite, 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 Clifi" and Wandsworth. 



11. Cardium striatclum. — The Small -striated Cardium, 

 pi. LXXXI. fig. 27. 



C. striatulum. Sowerby, VI. p. 101, pi. 553, fig. 1. Phil- 

 lips, Geo. York, I. pi. 11, fig. 7. 



Convex, orbicular ; posterior side 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 striae less regular, and the longitudinal ones doubly 

 numerous. 



12. Cardium dissimile. — The Dissimilar Cardium, pi. 

 LXXXII. fig. 22. 



C. dissimile. Sowerby, VI. p. 101, pi. 55.3, fig. 2. 



Gibbose, transversely obovate ; its length a trifle less than 

 its breadth ; smooth; shell thick, except near the beaks ; pos- 

 terior side bounded by a small rib, and longitudinally striated ; 

 front rather straight. 



The Lower Greensand, Sandgate, and the Portland Sand, 

 Tisbury, Swindon, &c. 



13. Cardium turgidum. — The Swollen Cardium, pi. 

 LXXXII. fig. 2. 



C. truncafum. Sowerby, IV. 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 fine, nearly obsolete striae ; margins bluntly 

 toothed. 



The London Clay, Barton, Hampshire. 



14. Cardium truncatum. — The Truncated Cardium, pi. 

 LXXXI. fig. 25. 



C. truncatum. Sowerby, VI. p. 102, pi. 553, fig. 3. Phil- 

 lips, Geo. York, I. pi. 13, fig. 14. 



Gibbose, transversely ovate, its length nearly equal to its 

 M'idth ; smooth ; posterior side obliquely truncated, and longi- 

 tudinally striated, the interstices between which, towards the 

 lieaks, are a little scabrous ; beaks small. 



The Lias, Yorkshire, Cotswold Hill, and Brambury Hill. 



15. Cardiu.m porulosum. — The Porous Cardium, pi. 

 LXXXI. fig. 16. 



C. porulosum. Sowerby, IV. 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 

 laminic, 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. 

 LXXXL fig. 16. 



C. globosum. Beau. Mag. Nat. Hist. New Ser. III. p. 60, 

 fig. 19. 



Nearly orbicular, infiated ; surface smooth, with many fine 

 concentric striae; posterior side 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, large 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 echinatum. — The Spined Cardium, pi. 

 LXXXI. 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. 



The 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. 



Siib-triangular ; anterior side 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 1 6. 



C. edule. Pennant, Brit. Zool. IV. p. 91, pi. 50, fig. 41. 



Somewhat globose, with from twenty-four to twenty-si.x 

 rounded, longitudinal ribs, crossed by transverse, scale-like 

 protuberances, separated by very narrow furrows. 



The Mammiferous Crag, Bramerton, and the 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 citri.\|Oideum. — The Citron-like Cardium, 

 pi. LXXXII. fig. 20. 



C. citrinoideum. Phillips, Geo. York, I. pi. 7, fig. 7. 

 Oblong-ovate ; beaks large ; hinge-line straight ; short ; sides 

 gently rounded ; base arcuated ; surface smooth and shining. 

 The Cornbrash, Scarborough. 



23. Cardium lobatum. — The Lobed Cardium, pi. LXXII. 

 fig. 26. 



