XVI. SOME OLIGOGENE LIZARDS. 



By Earl Douglass. 



Glyptosaurus ? montanus sp. no v. 



(Type, No. 1050, Carnegie Museum Catalogue of Vertebrate Fossils.) 

 The type of this species is the greater portion of a skull and man- 

 dible, a limb bone, and several separate shields. The specimen was 

 found by the writer in a hard nodule in the Lower White River 

 (Titanotherium) beds north of the Big Hole River at the southeastern 

 base of McCarty's Mountain, about fifteen miles north of Dillon in 

 Montana. It was associated with a considerable portion of a skeleton 

 of Ischyromys. The nodules containing the two specimens had been 



Fig. i. Glyptosaurus? montanus. Type No. 1050. Top view of skull. |. 



weathered out of the bed which enclosed them, but they were evi- 

 dently not far from their original position. At nearly the same level 

 were specimens of Limnenetes and Hyracodon. 



Distinguishing Characters. — The skull is broad posteriorly and grad- 

 ually narrows toward the muzzle. It is short in proportion to the ividth. 

 The orbits are large and oval with the long axis anteroposterior. Their 



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