108 
LUCINA antiquata. 
TAB. DLVII.—fig. 2. 
Spec. Cuar. orbicular, convex, ornamented with 
concentric lamine ; surface irregular ; ante- 
rior side angular ; lunette flat, lanceolate. 
Generauuy the lamin are worn off the surface, and 
leave it irregularly furrowed ; there are two teeth under 
the beaks, one of which is bifid, and one lateral tooth 
under the lunette ; the shell is moderately thick. 
I have not been able to refer this to any published 
species, although we possess many specimens from near 
Valognes, that accord precisely with the small unworn 
English ones. It approaches near to L, circinaria of La- 
marck. 
Occurs in Crag at Woodbridge, and other parts of 
Suffolk. 
LUCINA crassa. 
TAB. DLVIIL—fg. 3. 
Spec. Cuar. Nearly orbicular, convex; covered 
with thick, slightly elevated, concentric lami- 
ne ; superior margin obtuse ; lunette linear, 
concealed ; valves thick. 
A wittxe wider than long, rather flat in the middle, and 
irregular; the beaks are very small. 
Found by Mr. Weir in Sandstone at Horncastle, and 
by R. I. Murchison, Esq. at Brambury Hill, Suther- 
land. Our figure is from a specimen from the former 
place. 
