PLATE XV. 



Pig. 



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



belonos to Ur. Wrio-ht's collection. 

 i). „ „ Portion of a ray, dorsal surface, mag- 



nified twice. 



€. „ „ Ditto, with lateral spines, magnified 



four times. 



d. „ „ Ditto of terminal part, magnified four 



times. 



3. „ 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. OpHioDERiMA Egeuto^i, B)-odeHjj. p. 143. Basal surface, natm-al size; this 



specimen is in Dr. Wright's 

 cabinet. 



5. „ „ ■ ■ Under surface of the disk, magnified 



twice. 



5- „ „ , Portion of a ray, magnified four 



times. 



