TAB. XXI. 



Platemys Bullockii, half the nat. size. 



The plastron and some of the marginal plates, a a. 

 s. Entosternal. 

 es. Episternals. 

 ks. Hyosternals. 

 ps. Hyposternals. 

 xs. Xiphisternals. 

 ig. Intergular scute. 

 gu. Gular scutes. 

 hu. Humeral scutes. 

 pe. Pectoral scutes. 



ab. Abdominal scutes. The impression between these and the pectoral scutes 

 crosses the intercalated supernumerary bones between the hyosternals and 

 hyposternals. 

 fe. Femoral scutes. 

 an. Anal scute. 



Where the bones or scutes are in pairs, the figures or letters are placed on one of each 

 pair. 



