173 
ASTARTE plana. 
TAB. CLXXIX. — Fig. 2. 
Spec. Char. Nearly orbicular, depressed; sur- 
face plain ; lunette elongated, acute, deep ; 
margin entire. 
V" ery analagous in general form to A. Scotica ; and when 
the softer parts between the lamina have been corroded, the 
surface presents numerous concentric ridges ; otherwise, 
it is only marked with fine lines of growth. The shell is 
thick, equilateral, with a pointed beak, and entire mar- 
gin ; its length does not always bear the same proportion 
to the width, sometimes being equal to it, but oftener less. 
Occurs in a sandy alluvial stratum, at Bramerton, near 
Norwich, where I collected specimens in August, 1817. 
ASTARTE ©bliquata. 
TAB. CLXXIX.— Fig. 3. 
Spec. Char, Obovate, transverse depressed ; with 
many oblique concentric striae upon the sur- 
face ; margin crenulated. 
T he numerous regular impressed striae which cross the 
few lines, or rather waves of growth at a very acute 
angle, give rise to the name of this elegant shell; its 
width is greater than its length ; it is somewhat depressed 
and slenderer than most of the Genus : the spaces between 
the striae are rounded and smooth. 
My active correspondent, Mrs. Cobbold, discovered 
this shell in the Crag pits at Holywells, near Ipswich, 
and indulged me with specimens in 1812 : they are in a 
good state of preservation. 
