43 
HALIOTIS. SEA-EAR. 
lateral ones, and in the beaks inclining a little to the longer 
end : length a quarter of an inch ; breadth three eighths". 
Devonshire, and North Britain : very rare. v. m. 
6 . Donas rubra. Red IVedge-sheU. 
Montagu, Suppl. p. 38. 
Shell wedge-form, smooth, truncate at one end, of an 
uniform reddish color, inside the same, with the margin 
smooth: beaks obtuse ; hinge with two teeth in each valve, 
placed angularly, and approaching each other at their sum¬ 
mits: breadth not a line. 
Devonshire coasts, among Corallines : very rare. 
7. Donax Irus. Piercer IVedgc-sheU. 
Da Costa, pi. 15. f. (5, left hand fig.— Donovan, pi. 29. 
f. 2—■ Dorset Cat. pi. 12. f. 6 ‘, left hand fig. 
Shell somewhat oval, rugged, varying much in shape, 
sometimes nearly as long as it is broad, sometimes twice 
as broad as it is long, sometimes nearly flat, ancl often vfcry 
convex, brownish white, with numerous rather close-set 
transverse-broken or undulated membranaceous ridges 
which reflect upwards and are stronger towards on£ end, 
the interstices finely striate longitudinally; inside wdiite or 
flesh-color, with more or less of a purple tinge, the mar¬ 
gin plain and smooth : beaks small, nearer one end, much 
curved; teeth small, often three together giving it the ap¬ 
pearance of a Venus, two of them cloven : length about a 
quarter of an inch. 
Western coasts, and Howth in Ireland, imbedded in the 
hardest limestone: v. «. ' 
HALIOTIS. SEA-EAR. 
Shell with a single valve, ear-shaped, almost 
entirely open, with a longitudinal row of orifices 
towards the outer margin : spire lateral, and flat 
upon the shell. 
i 1. Haliotis tuberculata. Tubercled Sea-ear. Fig. 66. 
Lister, pi. 611. f. 2— Pennant, pi. 91 —Da Costa, pi. 2. 
f. 1, 2—Donovan, pi. 5 —j Dorset Cat. pi. 22. f. 1, 2. 
Shell thick, strong, opake, rough, flat, oval, striate Ion; 
. ; * gitudinally. 
