227 
TEREBRATULA ovoides, 
TAB, C— Upper figure . 
Spec. Char. Ovate, elongated; beak prominent; 
larger valve gibbous subcarinated; lesser valve 
convex. 
The sides have an obtuse angle or shoulder at about one* 
third the length from the beak ; more or less prominent in 
different specimens. Length almost twice the width; the 
front rounded, undefined. 
Found in blocks of Sandstone containing green Sand, in 
alluvial deposits of Gravel, fragments of Chalk, &c. in some 
parts of Suffolk, by my friend, Charles Wilkinson, Esq* 
TEREBRATULA lata, 
TAB, C . — Lower figure. 
Spec. Char. Orbicular, depressed; beak promi- 
nent; larger valve subcarinated at the back. 
The length and breadth of the smaller valve are equal. 
There is no perceptible difference between this and ovoides, 
excepting in the length. 
Found in blocks of Sandstone in the same situation as the 
last, at Gisleham, near Lowestoft, in Suffolk, by Mr. John 
Thurtell: the stone often contains grains of an argillaceous 
Iron ore. 
TEREBRATULA ornithocephala, 
TAB, CI. — Figs. 1, 2 5 and 4, 
Spec. Char. Ovato-rbomboidal ; depressed when 
young; elongated and gibbous when old; front 
straight, bounded by two obtuse lateral de* 
pressions, similar in each valve. 
The aperture in the elongated beak is large. Breadth of the 
shell equal to four-fifths of its length ; the sides being rather 
