Turtles 



11 



humerus (.114.1); 1 radius (.114.2); 1 phalange (.114.7). 2 mixed specimens 

 both with partial fragmented carapaces and plastra (.115); 3 cervical vertebrae 

 (.115.5-. 115.6); 2 humeri (.115.1 -.115.2); 2 scapulo-acromial processes (.115.3- 

 .113.4); 2 coracoids (. 1 15.8-. 1 15.9); 2 tibiae (.115.10-.115.il); 1 ilium (.115.12); 

 1 phalange (.115.13). Four individual specimens with fragmented carapace and 

 plastron (.116-. 119). Two mixed specimens with badly fragmented carapaces 

 and plastra (.120). 



Isolated elements: 16 nuchals (.123-.132)(3 USNM)(3 UF); (SCSM 

 91.170.1) partial plastron; 10 right and 2 left epiplastra (.133-. 144); 2 entoplas- 

 tra (.169-.170); 10 left and 3 right hyoplastra (.145-.151)(3 USNM)(3 UF); 1 

 right hypoplastron and xiphiplastron (.122); 5 left and 7 right hypoplasia (.152- 

 .157)(3 USNM)(3 UF); 6 left and 9 right xiphiplastra (.158-.168)(2 USNM)(2 

 UF); 8 right and 6 left 2nd costals (.227-.240); 3 right and 1 left 3rd costals (.241- 

 .244); 6 right and 3 left 4th costals (.245-.253); 7 right and 8 left 5th costals 

 C254-.268); 4 right and 3 left 6th costal (.269-.275); 4 right and 1 left 7th costal 

 (.276-.280); 56 peripherals (.171-.226); 1 mandible (.761); 2 right and 1 left 

 mandibular rami (.758-.760); 10 humeri (.289-.298); 8 femora (.281-.288). 



Characters used for identification: Identification of complete shells was based 

 on nuchal characters (Bentley and Knight 1993), and the alignment of the verte- 

 bral and pleural sulci (Ernst and Barbour 1989) (Fig. 4). 



Hyoplastron - The humeral sulcus does not cross dorsally over the plas- 

 tral scute overlap area, as in Clemmys. Terrapene and Emydoidea have hinged 

 plastra. Elements of comparable size can be separated from Deirochelys reticu- 

 laria as the dorsal scute overlap area in C. picta is wider and more sharply curved 



Fig. 4 Fossil carapace of Chrysemys picta (.110) from the Ardis local fauna. 



