SUB-CLASS I 



SELACHII 



41 



Bkinobatus, Bloch (Euryarthra, Ag. ; Spathobatis, Thioll.), (Fig. 82). Dorsal 

 fins without spines. Skin with 

 small shagreen granules. Com- 

 plete skeletons from the Litho- 

 graphic Stone of Bavaria and 

 France, the Upper Cretaceous 

 of Mt. Lebanon and Italy, and 

 the L T pper Eocene of Monte 

 Bolca. Also later Tertiary and 

 Recent. 



Asterodermus, Ag. Dorsal 

 fins with small spines. Sha- 

 green granules rather large, 

 stellate. A. platypterus, Ag., a 

 small species from the Litho- 

 graphic Stone of Bavaria. 



Belemnobatis, Thiolliere. 

 Lithographic Stone; Cerin, Ain, 

 France. 



Trygonorhina, Platyrhina, M. 

 and H. Eocene to Recent. 



Family 8. Tamiobatidae. 



This family, represented by 

 the unique Tamiobatis vetustus, 

 Eastman, from the Devonian or 

 Lower Carboniferous of Ken- 

 tucky, is of uncertain system- 

 atic position, but intermediate 

 between existing sharks and 

 rays. 



Family 9. Rajidae. Midler 

 and Henle. Skates. 



Trunk much depressed, form- 

 ing a broad, usually rhombic disk 

 with the pectoral fins, which extend 

 from the snout to the pelvic fins. 

 The latter fins with a strong, un- 

 segmented, cartilaginous ray in 

 front. Teeth small, with bifur- 

 cated root and rhombic crown, 

 forming a close pavement in each 

 jaw. Tail very slender, without 



. 7 ,7 7 7 r 77 Stone); Eiehstailt, Bavaria. (From a specimen 1", m. 



Spines, and the Caudal fin small Or the Palaeontological Museum, Munich.) 



absent. Skin with small, pointed 



shagreen granules and larger, scattered, spinous, placoid tubercles. Upper Cre- 

 taceous to Recent. 



Fig. -J. 



Uhindbatus miraMis, Wagn. Upper Jurassic (Lithographic 



lone in 



