93 



GRYPH^A bullala. 



TAB. CCCLXVIIL 



Spec. Char. Transversely obovate, irregular, 

 smooth, thin, depressed, beaks small; upper 

 valve concave ; lateral lobe obscure when 



old. 



fV HEN full grown this Grypbite 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 ditferent 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 laminge, assist in the 

 discrimination. 



A handsome series of this species has been liberally 

 afforded me by Mr. Weir, who obtained it in the Chinch 

 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. 



GRYPH^A vessiculosa. 

 TAB. CCCLXIX. 



Spec. Char. Subrhomboidal, oblong, deep; 

 lesser valve concave, vSmall, thin ; larger 

 valve curved, composed of several distant 

 coats. 



Longer than Avide, with pointed beaks, and a small 

 hinge ; the depth and width are equal ; both less than 



