128 



MEMOIRS OF THE CARNEGIE MUSEUM 



Comparative Measurements of Vertebrals. 



Comparative Measurements of the Pil.4.stron. 



Greatest length, pla.stron 



Greatest width, plastron 



Length, anterior lobe 



Width, anterior lobe at base .... 



Width of Hp 



Length of entoplastron 



Greatest width of entoplastron . . 



Length of posterior lobe 



Width of posterior lobe at base . . 

 Depth of posterior median notch . 



Width of notch 



Epiplastrals meet on midline .... 

 Hyoplastrals meet on midline. . . 

 Hypoplastrals meet on midline . . 

 Xiphiplastrals meet on midline . . 



Gulars meet on midline 



numerals meet on midline 



Pectorals meet on midline 



Abdominals meet on midline .... 



Femorals meet on midline 



Anals meet on midhne 



Type. 



460 



295 



120 



200 



65 



70 



95 



150 



200 



16 



55 



44 



125 



120 



80 



57 



40 



73 



115 



70 



52 



No. 3270. 



480 



390e 



135 



240 



90 



90 



96 



154 



230 



19 



55 



43 



108 



136 



95 



68 



47 



90 



110 



82 



65 



No. 2397. 



515e 



185 

 240 

 20e 



114 



160e 



100 



e, estimated. 



8. Echmatemys douglassi sp. nov. 



Plate XXII; text-figs. 11 and 12. 



Type: C. M. No. 3244, consisting of a somewhat damaged carapace with a 

 complete plastron. The carapace lacks portions of the peripheral borders of the 

 front and sides in addition to several smaU areas out of the costal and neural 

 regions. Collected by Earl Douglass, May 25, 1908. 



