PLATE XVI. 



Fig. 

 1 a. Ophioderma carinata, Wright, p. 148. Upper surface, natural size ; this 



specimen belongs to the col- 

 lection of J. Leckenby, Esq., 

 F.G.S. 

 h. „ „ Portion of a ray, magnified four 



times. 

 2. „ MiLLERi, F/iil/ips. p. 140. Portion of a ray, magnified three times. 



3 a. „ „ Upper surface of the disk, natural size. 



4. ,, „ A slab of Marlstone, with several speci- 



mens thereon in high relief, belonging 

 to the Museum .of the Yorkshire 

 Philosophical Society. 



