Sinclair.] A Ncir Tortoise. 245 



been thrust slightly to ward the right, as compared with the fifth. 

 The relative position of the marginals has remained practically 

 unchanged. 



Parts of the nuchal plate and of the first neural are repre- 

 sented. The second and third ncurals are preserved almost 

 entire. Six costals and eight marginals are also represented. 

 The relation of the neurals to the costals on the left side cannot 

 be determined exactly owing to the displacements already men- 

 tioned. The first neural is represented by its posterior portion. 

 The second approaches a hexagonal outline, with convex anterior 

 and concave posterior border. The third neural is also hexagonal 

 in outline with convex anterior border. The second costal plate 

 is in contact with the first and second neurals; the third, with 

 the second and third neurals. Three marginal plates oppose the 

 first costal plate. The fifth marginal opposes the third costal, 

 while parts of the fifth and seventh as well as the entire sixth 

 marginal are in contact with the fourth costal. The fifth and 

 sixth costals support one marginal each. The costal plates are 

 alternately wider and narrower at their dorsal and marginal 

 borders. 



Fig. '_!. Stylemys calaverensis n.sp. Plastron, ventral view. 



