114 
PECTUNCULUS minimus. 
TAB. CCCCLX1I —Jig. 5. 
Spec. Char. Orbicular, convex, smooth ; hinge- 
line straight, prominent at the extremities ; 
margin not toothed, 
V ery nearly ^equilateral, and almost as long as wide » 
the hinge teeth are but 4 or 5 on each side ; the want of 
teeth within the margin is connected with the plain 
surface. 
Found at AnclifF by the Rev. Mr. Cookson. It sel- 
dom exceeds a quarter of an inch in length. 
PECTUNCULUS oblongus, 
TAB. CCCCLXXI — -fig. 0. 
Spec. Char, Transversely oblong, inequilate- 
ral, rather convex, smooth ,* sides obliquely 
truncated ; margin not toothed. 
In one or two remarkable characters this resembles 
the last, but it is less convex, and much broader ' r its 
size is nearly the same. 
Sent from Aqcliff with the last. 
