SUB-CLASS I 



SELACHII 



41 



/ 



A-vL 



Eliinohatus, Bloch (Ewyarfhra, Ag. ; SpafJiobatis, Thiol!.), (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^pper Eocene of Monte 

 Bolca. Also later Tertiary and 

 Kecent. 



Asterodenmis, 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 Tamiobafis 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. M tiller 

 and Henle. Skates. 



Trunk much deiwessed, form- 

 ing a broad, usually rhombic disk 

 with the 'pectorcd fins, which eodend 

 from the snout to the pelvic fins. 

 The latter fins with a strong, un- 

 segmsnted, cartilaginous ray in 

 front. Teeth small, with bifur- 

 cated root and rhombic crown, 

 forming a close pavement in each Fig. s2. 



jaw. Tail very slender, without UMnobatus miraUKs, Wagn. Upper Jurassic (Lithographic 



7 .7 7 7/" 77 Stone); Eichstadt, Bavaria. (From a speeiuien I'V m. lona; in 



spines, and the caudal fin small or the Palaeontological Museum, JIunich.) 



absent. 



Skin with small, pointed 

 shagreen granules and larger, scattered, spinous, placoid tubercles. 

 taceous to Recent. 



Upper Cre- 



