VAEANID^l. 281 



Genus non det. 

 This form, which appears identical with Plestiodon cadurcensis of 

 Filhol l , has the teeth tall, cylindrical, and blunt. 

 Hah. Europe (France). 



R. 377. The greater part of the left dentary bone ; from the Upper 

 {Fig.) Eocene (Lower Oligocene) Phosphorites of Caylux (Tarn- 

 et-Garonne), Prance. This specimen (fig. 63) apparently 

 agrees with the fragmentary dentary figured by Filhol in 

 the ' Ann. Sci. GeoL' vol. viii. pi. xxvi. fig. 425, under the 

 name of Plestiodon cadurcensis. That it cannot, however, 

 belong to that genus is shown by the absence of the ridge 

 on the outer side descending from the coronoid ; it agrees 

 very closely with the dentary of Dijploglossus and OjoJii- 

 saurus. Noticed by the writer in the ' Geol. Mag.' dec. 3, 

 vol. v. p. Ill, as Placosaurus. Purchased, 1884. 



Fig. 63. 



External and inner views of the left dentary bone of an Anguoid Lizard ; 

 from the Phosphorites of Caylux. \. 



Family VAEANID^E. 



Postorbital bar incomplete ; temporal arcade complete ; supra- 

 temporal fossa not roofed over by dermal bones; both the pre- 

 maxillee and nasals united together. Dentition pleurodont ; teeth 

 large ; palate toothless. Haemal surface of the centra of the dorsal 

 vertebrae broad, flat, and devoid of carina. No dermal scutes. 



Genus VARANUS, Merrem \ 



Including : — Monitor, Gray 3 . 



Hydrosaurus, Wagler 4 . 

 Megalania, Owen 5 . 



The only genus, the so-called Palwovaranus being an Anguoid. 



1 Ann. Sci. Geol. vol. viii. p. 266 (1877). 



2 Tent. Syst. Ainphib. p. 58 (1820). 



8 Ann. Nat. Hist. vol. i. p. 392 (1838). 



* Syst. Amphib. p. 1«4 (1830). B Phil. Trans. 1859, p. 43. 



