Tectospondyli. 87 



Fia. 114. FIG. 115. 



FIG. 114. Squatina alifera, Miinst. sp. (after Fraas), Lithographic Stone (Upper Oolite), 



Bavaria. 



FIG. 115. Squalina spetiosa, Meyer ; Lithographic Stone (Upper Oolite), Bavaria. 

 a, mandibular cartilage ; 6. pectoral arch ; c, pectoral fin ; d, pelvic arch ; e, pelvic fin. 



FIG. 116. Jaws of Male (A) and of female (B) Thornback Skate, Raja davata, showing the 

 remarkable variation in the dentition which they exhibit. 



