278 SQTJAMATA. 



Family ANGUID^E. 



Postorbital bar and temporal arcade complete; supratemporal 

 fossa roofed over by bony scutes ; premaxillae and nasals separate. 

 Dentition usually pleurodont ; teeth may be present on the ptery- 

 goids, palatines, and vomers, and are generally obtuse. Dermal 

 scutes present and marked by tubercular sculpture. The vertebral 

 centra much flattened inferiorly, and very like those of the 

 Varanidve. 



Genus OPHISAURUS, Daudin 1 . 



Syn. Pseudopus, Merrem 2 . 



Limbs absent externally, or with only a rudiment of the pelvic 

 pair ; teeth on pterygoids, and in some cases on palatines. 



Ophisaurus mogunthms (Boettger 3 ). 

 Syn. Pseudopus moguntinus, Boettger 4 . 



The distinctive characters are not clearly known, and this species 

 may belong to Propseudopus, Hilgendorf *. 

 Hab. Europe (Germany). 



42756. A split slab of lignite containing the impression of a con- 

 siderable portion of the skeleton and scales ; from the 

 Lower Miocene of Bott, near Bonn. The end of the tail 

 has been renewed during life ; the squamation of the 

 renewed part being like that of Anguis. The slab also 

 contains the impression of part of the vertebral column of 

 a Lacerta. Van Breda Collection. Purchased, 1871. 



The following genus may be included in the present family, although 

 it has been made the type of a distinct family — the Placosau- 

 rida3. The American Eocene genera Saniva, Leidy G , Glypto- 

 saurus, Marsh 7 , and Peltosaurus, Cope 8 , are probably allied. 



Hist. Eep. toI. vii. p. 346 (1803). 



2 Tent. Syst. Amphib. p. 78 (1820). 



3 Ber. Senckonb. nat. Ges. for 1873-74, p. 79 (1874).— Pseudopus. 4 Loc. cit. 

 5 Zeitschr. deutsch. geol. Ges. vol. xxxvii. p. 358 (1885). 



8 See Eep. U.S. Geol. Surv. Terrs, vol. i. pp. 181-183 (1873). 



7 See Leidy, loc. cit. 



8 Rep. U.S. Geol. Surv. Terrs, vol. iii. Vertebrata of the Tertiary Formation! 

 of the West. Book i. pp. 1.02. 722 (188 



