118 



MEMOIRS OF THE CARNEGIE MUSEUM 



only slightly bracket-shaped. The first is hexagonal, very narrow in front, in this 

 respect closely resembling the first in Baena inflata. The surfaces within the first, 

 second, and third vertebral areas are flattened, but the fourth and fifth are trans- 

 versely broadly convex. The principal dimensions of the vertebrals are given 

 in the accompanying table. 



Dimensions of Vertebrals. 



e, estimated. 



As in Baena riparia Hay and B. hatcheri Hay, there are five costal scutes. A 

 small supernumerary scute is situated on each side of the first vertebral, showing a 

 difference from the former species by bordering on the nuchal, whereas in B. 

 riparia these scutes are not in juxtaposition. 



On the plastron only the sutures defining the mesoplastron on the right side 



Fig. 6. Baena gigantea, pl&stron. Type, C. M. No. 3441. About one-fifth natural s 



size. 



