PLATE XV. 



Fig. 



la. Ophioderma Gaveyi, /Fny///. p. 147. Upper surface, natural size; this specimen 



belongs to Dr. Wright's collection. 

 I, „ „ Portion of a ray, dorsal surface, mag- 



nified twice. 

 e. „ „ Ditto, with lateral spines, magnihed 



four times. 

 d. „ „ Ditto of terminal part, magnified four 



times. 



2. „ „ Disk and dorsal plates, natural size. 



3. „ „ Three rings of a ray, magnified six times; 



this specimen belongs to Dr. 

 Wright's collection. 

 4 a. OpHiODERMA Egertoni, Broderip. p. 143. Basal surface, natural size; this 



specimen is in Dr. Wright's 

 cabinet. 

 b- „ „ Under surface of the disk, magnified 



twice. 

 5. „ „ Portion of a ray, magnified four 



times. 



