GRYPELEA bullata. 
TAB. CCCLXYIII. 
Spec. Char. Transversely obovate, irregular, 
smooth, thin, depressed, beaks small; upper 
valve concave ; lateral lobe obscure when 
old. 
"W" hen full grown this Gryphite is often wider than long, 
and the very small beaks, although incurved, have not 
the great degree of curvature common to other species 
of the genus. In the young state the beaks are more 
prominent, and the lateral lobe, although small, is distinct 
and very different from the spurious ear sometimes ob- 
servable in Oysters ; the surface is smooth and undulated, 
not imbricated ; the substance uniformly thin, and the 
point of attachment generally minute. 
Although much resembling an Oyster in general form, 
there is a something in the aspect that distinguishes this 
shell from that Genus, and the two genera; from each 
other ; the existence of a lobe in the young state confirms 
this a Gryphite ; the uniform rounding of the convex 
valve, and the want of imbricated lamina;, assist in the 
discrimination. 
A handsome series of this species has been liberally 
afforded me by Mr. Weir, who obtained it in the C lunch 
Clay, at Bracken Wood End, near Horncastle in Lin- 
colnshire ; the thickness of the shell joined to its con- 
vexity, has given rise to the name of bullata. 
GRYPHiEA vessiculosa. 
TAB. CCCLXIX. 
Spec. Char. Subrhomboidal, oblong, deep; 
lesser valve concave, small, thin ; larger 
valve curved, composed of several distant 
coats. 
Longer than wide, with pointed beaks, and a small 
hinge; the depth and width are equal; both less than 
