127 



GRYPHiEA gigantea. 

 TAB. CCCXCl. 

 Spec. Char. Orbicular, rather smooth; upper 

 valve thin, concave; lower valve convex 

 with a small, sharp, incurved beak ; hinge 

 small. 

 A large, regularly formed shell ; the edges of the im- 

 bricated laminae of the lesser valve, are but little eleva- 

 ted ; they are even, and placed at regular intervals. The 

 small hinge pit distinguishes this species from G.dilata- 

 ta, tab. 149. The anterior lobe, is separated from the 

 rest of the shell, by a small sinus in the edge of each of 

 the laminge; The length and breadth are nearly equal, 

 the depth is about one fifth of the length. 



In the description of G. dilatata, tab. 149, this shell 

 has been unfortunately confounded with that species, 

 owing to the want of such specimens as possessed the 

 specific distinctions ; it appears that the one before us, 

 is confined to the inferior, or Iron shot Oolite, while 

 variety a of the dilatata belongs to the Clunch Clay and 

 others to the KeUoways Rock. 



GRYPH^A globosa. 

 TAB. CCCXCll. 



Spec. Char. Subglobose, oblique, smooth, 

 thin ; beak largely truncated ; upper valve 

 immersed, concave. 



Syn. Ostrea vessicularis, Lam. Hist. Nat. 

 VI. pt. 1. p, 218. Cuvier and Srogniart, 

 env. de Paris, ed. 1822, 383, tab. 3. Jig'. 5. 

 Podopsis gryphaeoides, Xam. Hist. Nat. VI. 

 pt. 1, 195. 



X HE large surface by which this shell is generally 

 attached entirely destroys the curved form of the beak, 

 usually met with ina Gryphite ; the free portion rises from 

 the substance to which it is attached in a very bold curve 

 almost forming a cup with a concave, immersed lid, but 



