GiLMORE: A New Species of Tortoise. 11 



The posterior lobe diminishes rapidly in width, backward from 

 the hypo-xiphiplastral suture, much as in Probaena sculpta Hay. 

 Its posterior extremity is truncated, ending 38 mm. anterior to the 

 hinder margin of the carapace. The free borders of the hinder lobe 

 are acutely edged, the bones being but little thickened back from the 

 margin. The bridge is 87 mm. wide. The sulci of the plastron can 

 only be made out in part as shown in Fig. 2. The gular scutes are 

 broad, the sulci bounding them (See Fig. 2) curving outward and 

 slightly backward, much as in G. plicatnlus, but not approaching the 

 epi-hyoplastral sutures so closely as in the latter species. The inter- 

 gulars cannot be dififerentiated. The gular-humeral sulcus cuts across 

 the antero-median part of the entoplastron. The humero-pectoral 

 sulcus passes almost straight across and behind the entoplastron. 

 Inframarginal scutes are present on the bridge, but their full outlines, 

 or exact number, cannot be determined from the present specimens. 

 They appear to lie almost entirely on the plastral bones. 



The present species is distinguished from Glyptops plicatulus (Cope), 

 described from the same geological horizon, by the following differ- 

 ences: 



(1) Elongated-oval contour of the carapace and its relatively narrow 



transverse diameter. 



(2) Difference in the pattern of the ornamentation of the carapace 



and sculptureless plastron. 



(3) Posterior lobe of plastron relatively narrow. 



(4) The greater width of the gutter on the peripherals. 



(5) Deeper median anterior emargination, with a narrow notch on the 



median posterior border of the carapace. 



(6) The greater length of the eighth neural. 



From Glyptops ccdatus Hay the present species is distinguished at 

 once by the coarser and more regular ornamentation of the carapace 

 in the former. From G. pervicax, the relatively longer and narrower 

 anterior lobe of the present species is a distinguishing character. 

 From G. depressus Hay the species is differentiated by the narrower 

 nuchal and neural bones, by the regular decrease in width of the costals 

 from front to back, and the relatively narrower mesoplastrals. 



Specimen No. 3380 from the same geological level and from the 

 same locality, although showing some differences, such as a longitudinal 

 sulcus, or groove, at the junction of the second, third, fourth, and fifth 

 costals with the peripherals, different contour of the entoplastron, and 



