G. B. Wieland — Upper Cretaceous Turtles. 195 



(B) Anterior portion of the skull of Lytoloma sp. 



(Yale specimen No. 913 a = X. angustat.) 



Uncrushed. 



Length of palatal surface of vomer _ 3*3 



Width " " " __. 20 



Length of palatal surface of premaxillary 2*7 



Greatest width of palatal surface of premaxillary.. 1*0 

 Greatest thickness of vomeral partition between the 



nares 1*1 



(C) The carapace of Lytoloma angusta. (Elements 



uncrushed and disarticulated. Yale specimen 



No. 625.) 

 Length (estimated to within one or two centimeters) 58* 

 Breadth (greatest, as measured across anterior end 







(1) Bony Plates. 







(a) 



fb) 



(o) 





Exact length 



Width along 







on outer edge of 



groove of 



Greatest 





carapace. 



horn-shields. 



thickness 



Nuchal 









_. 



1st marginal 









2d 







__ 



._ 



3d " 



._ 



__ 





4th 



5-5 



2-5 



2-4 



5th " 



7'2 



3 6 



2-3 



6th 



. 7'2 



4-3 



2-2 



7th 



8' 



4-8 



1*8 



8th " 



8- 



5-6 



1-5 



9th " 



8-2 



6- 



1-3 



10th " 



7-5 



6- 



1-3 



11th " 



7'8 



5'5 



1-5 



Pygal " 



4-7 



(5-5) 



1-8 





Length, on 



Greatest 







median line. 



width. 



Thickness 



Nuchal 







• 





1st neural 



(5-0) 



(4-0) 



._ 



2d 





(5-0) 



(5-0) 





3d 





4-4 



4-4 



•6 



4th ' 





- (5'5) 



(4-2) 





5th < 





4'1 



4-1 



•7 



6th < 





4-1 



3-4 



•7 



7th < 





-- (3-1) 



(3-3) 





8th " 





(3-0) 



(2-7) 





9th " 



(3-5) 



(3-0) 





Antero-pygal 



3-7 



8-0 



1-1 



Postero-pygal 



6-0 



(8-0) 







Margin 



alo- " 



6-0 



4-7 



1-8 



