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PROCEEDINGS OF THE NATIONAL MUSEUM 



VOL. 88 



The presence of dermal scuta and pleurodont teeth, closely set 

 with swollen obtuse summits, indicates the affinities of Xestops piercei 

 to lie in the family Anguidae. 



From Xestops vagans this species is distinguished by its much 

 smaller size and by the pitted character of the dermal scutes. The 

 other species of the genus are all based on inadequate specimens and 

 all are doubtfully referred, and in all probability they pertain to 

 other genera. Their retention in Xestops has simply been a matter 

 of expediency, and contrasting the present specimen with them would 

 be of little significance. 



FiGnBB 8. — Left maxillary of / Harpagosaurus ailberlinffH, new Bpecles, type (D.S.N. M. no. 

 13877) : A, External viow ; B, internal view. Five times natural size. 



SAURIA OF UNKNOWN FAMILY REFERENCE 

 Genus HARPAGOSAURUS Gilmore 



7 HARPAGOSAURUS SILBERLINGn, new specie* 

 FlQUBB 8 



Type. — U.S.N.M. no. 13877, consisting of the greater portion of a 

 left maxillary containing whole or parts of 12 teeth. Collected by 

 A. C. Silberling, 1908. 



Type locality. — Sec. 4, T, 5 N., R. 16 E., Sweetgrass County, Mont. 



HoHzon. — Fort Union No. 2, Paleocene. 



Description. — The type maxillary lacks a portion of its anterior 

 end, and only 5 of the 12 teeth have their complete crowns preserved 

 as shown in figure 8. 



The teeth, of which there is evidence of 14 in all, are pleurodont, 

 with long shafts, rounded on the internal side but flattened on both 



