6 



M. 



Median width of parietals .014 



" " frontals 008 



Length mandibular ramus to cotylus 040 



Diameter vertebral centrum (transverse) 003 



Length. " " 0055 



Size about that of the American Heloderma. 



The genus is allied to the Glyptosaurus of Marsh. 



Testudo culbratus, sp. nov. 



This species introduces several from the same formation as the Pelto- 

 saurus, which agree with the existing genus Testudo in their short, stout 

 metapodal and phalangeal bones, and single anal scutum of the carapace. 



In the present species the prominent peculiarity is seen in the form of 

 the hip of the anterior lobe of the plastron, each half of which is an 

 elongate pyramid, its depth and width being equal. The marginal bones 

 were short, stout and recurved ; length of carapace nearly 18 inches. 



Testudo laticuneus, sp. nov. 



In this species the anterior hip of the lobe of the plastron is very 

 prominent and wedge-shaped, and with dentate margin, and is flat and 

 thin. The posterior lobe is sub-truncate. The mesosternal bone is 

 hexagonal and broader than long, and is pointed behind. The pygal 

 bone is triangular and the anal marginal is convex in both sections and 

 abbreviated below. Each marginal bone behind the bridge presents a 

 mucro where a dermal suture reaches the margin. Anal scutum very 

 wide. All the sutures double lines. Length from eighteen inches to 

 two feet ; width two -thirds of the length. Carapace rather flattened. 



This is the most abundant species of the formation ; several good 

 specimens obtained. 



Testudo amphithorax, sp. nov. 



Anterior lobe of plastron broadly truncate, scarcely lipped ; posterior 

 lobe openly emarginate. Mesosternum longer than broad, acute in front, 

 very obtuse behind. All the sutures simple. Aual marginal shortened 

 but convex. Form depressed. Length and width as in the last. 



Testudo ligonius, sp. nov. 



Posterior lobe of plastron produced into two flattened sharp-edged, 

 wedge-shaped processes separated by a deep notch, as in Hadrianus 

 eorsonii. Marginal bones behind very wide, or considered separately, 

 long and narrow, with a step-like angle and notch where the scutal 

 suture reaches the margin. 



The form of the anterior lobe of the plastron is yet uncertain, though 

 fragments found with the type, resemble that of T. laticuneus. At least 

 those incomplete specimens obtained. 



Issued August 20, 1873. 



