196 G. R. Wieland — Upper Cretaceous Turtles. 



Length over Median 



curvature. width. 



1st pleural.. 20- 5- 



2d " 24- 6- 



3d " 25- 5-5 



4th " .._ 25-5 5-3 



5th " 24-5 5- 



6th " 22- 5- 



7th " 19- 5-5 



8th " __ 15- 5* 



(The large pleuro-marginal fontanelles are approximately one- 

 third the length of the pleurals which respectively bound them.) 



(2) Horn-shields. 



Length on median Greatest 



line of carapace. breadth. 



Nuchal 



1st vertebral 11- 



2d " 10- 14-5 



3d " 11- 13-5 



4th '" 11*4 15- 



5th " 



Length of fifth-eleventh marginal horn-shields, respectively, 

 measured along outer border of carapace : — 6*5, 1 m 5, 8*0, 8*5, 8*0, 

 8-0, 7-5. 



LETTEKING OF PLATES V-VIII. 



(a) Bone Plates : — N, Nuchal ; 1-9, Neuralia ; A, Antero-, P, Postero-, M, 

 Margin al-Py gal ; I-VII1, Pleuralia ; M9-M11, 9th-l lth Marginals ; s (in 

 Plate V), Supernumerary neural. 



(b) Horn Shields : — n, Nuchal ; v, v, v, v, v, lst-5th Vertebralia ; c, c, c, c, 

 lst-4th Costalia ; S (in Plate V), Supernumerary vertebral ; 10-12, Margi- 

 nalia ; /, /, /, Pleuro-marginal fontanelles. 



Yale University Museum, 

 New Haven, Conn. 



