EEPTILIA OF KIETLAND FORMATION GILMORE 173 



Table 2. — Comparative measurements of vertebrals of Boremys grandis 



The entoplastron is diamond-shaped, as in the other species of 

 the genus (fig. 10). At the center the mesoplastrals meet on the mid 

 line for 48 mm. These bones gradually widen from the center out- 

 ward. The other sutures of the plastron are obliterated. The gulars 

 meet on the median line for 26 mm ; the intergulars for 23 mm ; the 

 humerals for 84 mm; the pectorals for 62 mm; the abdominals for 

 67 mm ; the femorals for 90 mm ; the anals for 45 mm. 



There are four large inframarginal scutes on the bridge (fig. 10). 

 Boremys grandis is at once distinguished from B. pulchra and B. 

 alhertcnsis by its much larger size and by the anterior lobe of the 

 plastron being longer than the posterior. In the broadly rounded 

 contour of the front of the carapace it resembles B. pulchra but 

 is distinguished from B. alhertensis with its pointed end. 



Wiman (1933) briefly describes and figures a carapace from New 

 Mexico, referred to Bo£nu nodosa, which he says has the usual sculp- 

 ture of that species but which has abnormal lateral and marginal 

 scutes. The arrangement of these scutes strongly suggests the con- 

 ditions found in the genus Boremys and indicates that perhaps this 

 particular specimen may be a member of Boremys. 



A second specimen (U.S.N.M. no. 12978), consisting of the 

 right two-thirds of the carapace, and the plastron lacking the end 

 of the posterior lobe, is also identified as pertaining to the present 

 species. It was collected by N. H. Boss from the Kirtland in Brim- 

 halls Wash, San Juan County, N. Mex., June 27, 1929. This speci- 

 men is slightly smaller than the type and displays some differences in 

 the proportions of the scutal areas, but nothing more than might be 

 expected in individual variations. In the general form of the cara- 

 pace and plastron and in the character of the ornamentation of the 

 carapace surface, the two specimens are in close accord. 



