Douglass : Some Oligogene Lizards. 281 



little above the dental borders of the maxillaries the shields end ab- 

 ruptly, leaving a border of the maxillary bare. There were undoubt- 

 edly shields on the skin of the lower part of the head or throat. 

 There are six still in the matrix beneath the post-coronoid portion of 

 the mandible. There are also some larger, rather thin shields, which 

 probably belong to the lower part of the body. 



The tubercles on the shields of the head are arranged in imperfectly 

 concentric rows. There are from three to five or six of these rows on 

 each scute. The tubercles are nearly equal in size. As before stated 

 the shields are convex on the upper surfaces. 



Measurements. 



mm. 



Length of skull, approximately 48 



Posterior width of skull 35 



Width of skull between the orbits 12 



Height of skull 16 



Height of skull including mandible 23 



Antero-posterior diameter of orbit 19 



Vertical diameter of orbit 10 



Antero-posterior diameter of largest shields on skull 5 



Transverse diameter of largest shields on skull 3.2 



Length of body shields 7.4 



Estimated length of humerus 30 



Diameter of shaft of humerus 2.7 



These remains probably represent a lizard not less than 13 or 14 

 inches in length. 



This specimen undoubtedly belongs to the family Anguidae, and ap- 

 parently to the genus Glyptosaurus Marsh, though I have not had the 

 opportunity of examining the various types of Glyptosaurus and they 

 are not figured. 



In all the species as in all known members of the family Anguidae 

 the skull is covered with shields and the teeth are pleurodont. 



For convenience I give below the characters of the different species 

 given by Marsh. This will aid in making comparisons with the 

 specimens here described. 



Glyptosaurus sylvestris Marsh. 



American Journal of Science (3), I, 1871, p. 456. 



The shields on the frontals between the orbits are of moderate thick- 

 ness and are but little elevated. In the middle row on each frontal 



