ARCHEG0SAUR1DJ5. 



1/ i 



the present species ; from the reputed Permian of Texas. 

 The larger specimen has the same dimensions as the 

 vertebra above mentioned ; and all the specimens show the 

 characters of those figured by Cope in the ' Trans. Amer. 

 Phil. Soc/ 1886, pi. i. (see also Zittel ' Handbuch der 

 ' Palaeontologie/ i. Abth. iii. Band, 2 Lief. p. 395, fig. 384). 



Purchased, 1885. 



Family ARCHEGOSAUEID^E. 



Vertebrae (at least in the greater part of the column) of the 

 rhachitomous type. Skull with the occipital condyles either carti- 

 laginous or ossified ; the palatines running parallel to the maxillse ; 

 large palatine vacuities ; and an ossified sclerotic ring. Dentine of 

 teeth generally with simple radiate foldings. A ventral armour of 

 scutes. 



Tt has been proposed to arrange the genera here included in this 

 family in several families ; but for the present, at least, such divisions 

 cannot be maintained. 



Genus ARCHEGOSAURUS, Goldfuss \ 

 Skull (fig. 43) with the occipital condyles unossified, and no 



Pig. 43. 



Arckegosaurus decheni. — Frontal aspect of the cranium, with the sculpture 

 omitted ; from the Eotbliegendes (Lower Permian) of Saarbriick. About \. 

 Letters as in fig. 36. (After Miatt.) 



1 Beitr. vorwelt. Fauna d. Steinkohlengebirges, p. 3 (1847). 

 TAKT IV. N 



