A(T1N()I'TKUV(;II. 



99 



truthless; but the vomer, which is prolably Mingle, is furnished with a 

 tlmse cluster of comparatively large teeth. The mandible Is constituted 

 as in Lepidotua, but is remarkably short and deep. There are no traces of 

 iMtieations in the sheath of the notochord, but the vertebral arches are 

 well calcified. The neural spines are separate from their respective arches 



A. 



B. 



Fio. 70. 



Dapeditts politus ; restoration, external aspect (A), and with scales removed (B). 

 one-quarter nat. size. L. Jurassic (L. Lias) ; Dorsetshire. (From Brit. 

 Mus. Catal) 



except in the hinder half of the caudal region ; and the ribs do not extend 

 to the ventral border of the fish. There are no interniuscular bones. 

 Dapedtus is confined to the Lias, in which it is represented by many 



72 



