114 



MEMOIRS OF THE CARNEGIE MUSEUM 



three, and four is a narrow low ridge, on either side of which are parallel grooves 

 much as in B. emilice. The principal dimensions of the vertebrals as well as those 

 of a second individual, C. M. No. 3442, referred to this species, are given in the 

 accompanying table. 



Dimensions of Veetebkals. 



The nuchal scute is rectangular, being about 17 mm. long and 30 mm. wide on 

 the free border. It is bordered on either side, as shown in specimen No. 3442, 

 by small triangular first marginals. The second marginal has its greatest width 



Fig. 3. Plastron of Bai-nn inflata C. M. No. 3406, Type, restored after C. M. No. 3442. One-fourth 

 natural size. 



(36 mm.) on the free border. The first vertebral is bordered on either side by 

 small triangular supernumerary costal scutes, though there is no indication of these 

 in specimen No. 3442. 



It is estimated that the plastron had a total length of about 365 mm. It is 



