I 



i 



PLATE XVII. 



Fig. 



1 a. Ophioderma Gaveyi, Wright, p. 147. Under surface, natural size ; this 



specimen belongs to the Museum 

 of the Worcestershire Natural 

 History Society. 



h. „ „ Portion of a ray, magnified three 



diameters. 



2 a. Ophiolepis Murravii, Forbes, p. 151. Under surface, natural size, on a slab 



of Marlstone; this specimen be- 

 longs to Dr. Wright's collection. 

 b. „ „ The same, magnified two diameters . 



3. „ Portion of a ray, magnified four 



times. 



4. „ „ Ditto, magnified four times. 



5 a. AcROURA Brodiei, Wright, p. 153. Specimen, natural size ; this specimen 



belongs to the collection of the Rev. 

 P. B. Brodie, F.G.S. 

 b. ,, ,, The same, magnified three diameters. 



