446 
CONCHIFERA. 
hinge numerous, serrated, close set, alternately inserted into 
opposite valves; ligament external. 
Section * Lower margin not crenated. ** Lower margin 
internally crenated. 
Area Nuce. — Noah’s Ark. 
Plate LXXXIX. fig. 9. 
Oblong, striated transversely, and longitudinally ribbed ; um- 
bones remote, and encurvated; margin entire and gaping; 
cream-white, with divergent and zigzag chestnut stripes ; inside 
white. Two inches broad. Inhabits the American and British 
seas. 
Genus 13. — CUCULLiEA.— Lamarck. 
Generic Character.— Equivalve, inequilateral, trapeziform, 
ventricose ; beaks distant, separated by the area of the ligament; 
muscular impressions elevated before; margin angulated, or 
with an eared produced border; teeth of the hinge straight, 
very small, and set transversely, with from two to five small 
parallel ribs ; ligament external. 
Cucullcea auriculifera .— The Eared Cuccllaia. 
Plate LXXXIX. fig. 10. 
Obliquely heart-shaped, ventricose, with decussated strife; 
reddish-brown ; hinge with two parallel ribs at each end; white 
within, and slightly tinged with violet. Two and a half inches 
broad. Inhabits the Indian ocean. 
TRIBE IV.-CARDIACEA. 
Having irregular primary teeth, both in form and situation ; 
and accompanied by one or two lateral teeth for the most part. 
Genus 14.—IS OC AUDI A— Lamarck 
Generic Character. —Equivalve, heart-shaped, ventricose ; 
beaks very distant, divergent, and spirally turned to one side; 
hinge with two primary flattened teeth, situated under the beak, 
and with an elongated lateral one under the ligament; ligament 
external. 
