ABNORMALITIES IN CHELONIA. 



79 



GRAPTEMYS GEOGRAPHICA. 



they shown signs of suppression and in the majority of specimens 

 are of insignificant size. The axillary and inguinal scutes of the 

 Emydidae, etc., correspond, I believe, to two of these smaller 

 scutes that are undergoing suppression in Chelydra. They have 

 persisted in the Emydidae probably because they were needed to 

 fill in the angles between the plastrals and marginals. Aroma- 



