SÜB-CLASS I 



SELACHII 



41 



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

 fins without spines. Skin with 

 small shagreen granules. Com- 

 plete skeletons from the Litho- 

 graphie Stone of Bavaria and 

 France, the Upper Cretaceous 

 of Mt. Lebanon and Italy, and 

 the Upper Eocene of Monte 

 Bolca. Also later Tertiary and 

 Recent. 



Asterodemius, Ag. Dorsal 

 fins with small spines. Sha- 

 green granules rather large, 

 stellate. A. platypterus, Ag., a 

 small species from the Litho- 

 graphie Stone of Bavaria. 



Belemnobatis, Thiolliere. 

 Lithographie Stone; Cerin, Ain, 

 Franee. 



Trygonorhina, Platyrhina, M. 

 and H. Eocene to Eecent. 



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- 

 atie Position, but intermediate 

 between existing sharks and 

 rays. 



Family 9. Rajidae. Müller 

 and Henle. Skates. 



Trunk WMch depressed, form- 

 ing a broad, usually rhombic disk 

 with the pedoral 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 dose pavement in each 

 jaw. Tail very slender, without 



Dorsal 



Fro. 82. 



Ilhinobahis mirabüis, Wagn. Upper Jurassic (Lithographie 

 , ,, 7 7 /» 77 Stone); Eichstädt, Bavaria. (From a specimen 1-7 m. long in 



Spmes, and the Caudal fin small or the Palaeontological Museum, Munich.) 



dbsent. Skin with small, pointed 



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

 taceous to Recent. 



