So 



H. H. NEWMAN. 



CHRYSEMYS MARGINATA (188 specimens examined). 



A tabulation of the above results shows : 



Right Side. 

 I. 4 scutes 



II. 20 " 

 III. 13 



Total : 37 " 



Right Side. 

 I. 4 scutes 

 II. 8 " 

 III. I " 



Total : 13 " 



Grapheniys 



Ch rysemys 



Left Side 

 5 scutes 



20 " 

 10 " 



35 " 



Left Side. 

 2 scutes 



4 " 

 I " 



chclys odorata (Fig. 53) shows a curious survival of inframarginals, 

 having invariably only two scutes, one large and the other very 

 small and vestigial. From its position, separating the pectoral 

 shields from the marginals, I would homologize this large scute 

 with no. II. and the vestigial scute with no. I. Complete sup- 

 pression of the inframarginal row has occurred in the terrestrial 

 genera of the Emydida?. 



2. Interplastrals. 



The occurrence of traces of the interplastral row are not 

 nearly so frequently found as those of the inframarginals. Yet 

 they are sufficiently numerous and definite to note in this con- 

 nection. Traces have been found in Chelydra, Grapteuiys and 

 Cliryseinys. In preparing a list of these occurrences it will be 

 convenient to number the places where such scutes might occur, 



