448 
CONCHIFERA. 
Cardita sulcata. — The Furrowed Cardita. 
Plate LXXXIX. fig. 15. 
Subcordate, white, tessellated with brown; having longitu¬ 
dinal, convex transversely striated ribs ; posterior depression 
heart-shaped. One inch long. Inhabits the Mediterranean. 
Genus 18.—CARDIUM.— Linnceus. 
Generic Character .—Equivalve, subcordate; beaks pro¬ 
minent ; the interior margins of the valves denticulated or pli¬ 
cated ; hinge with four teeth in both valves; with two ap¬ 
proximate primary oblique teeth; mutually inserted and cross¬ 
ing each other; two lateral remote teeth. 
Cardium edule .— The Edible Cardium, or Cockle. 
Plate LXXXIX. fig. 14. 
With about twenty-six depressed ribs, and transverse obsolete 
scales; outside yellowish white, and inside white; beaks pro¬ 
tuberant. One to one and a half inches long. Inhabits the 
European seas. 
TRIBE V.-CONCHACEA. 
With at least three primary teeth in one valve, and the other 
generally the same, although sometimes with less. 
Sub-Division I.—Inhabiting the sea. Usually destitute of 
lateral teeth. 
Genus 19.— V E NE RIC A RDI A.— Lamarck. 
Generic Character .—Equivalve, inequilateral, suborbicular ; 
generally with longitudinal radiated ribs ; hinge with two teeth, 
the second one oblique. 
Venericardia imbricata. — The Imbricated Venericardia 
P late LXXXIX. fig. 17. 
Suborbicular, having convex longitudinal ribs, covered with 
imbricated, rough scales. One and a half inch long. Fossil at 
Grignon. 
Genus 20. — O R T Y GIA Leach. 
Generic Character. — Shell equivalve, transverse, three primary 
