G. M. Wieland — Upper Cretaceous Turtles. 127 



— As to the exact systematic position of the family to which 

 Osteopygis (and Propleurd) belong I feel abundantly justified 

 in for the present withholding final judgment, but think it 

 would seem best for the time being to retain these genera in 

 Cope's Propleuridse, and separate Lytoloma in another family, 

 the Lytolomidse. 



Measurements of Osteopygis Gibbi. 

 (Skeletal parts uncrushed.) 



(A) The Carapace. 



Length on straight line 74*3 cm 



" over curvature (greatest) 69*0 



Greatest width _ 58* + 



Projection beyond front end of plastron _ 9-4 



" " hinder " " 22-4 



(1) Bony Plates of the Carapace. 



Nuchal 



1st Marginal 



2d 



3d 



4th 

 5th 

 6th 

 7th 

 8th 

 9th 

 10 th 

 11th 



Median or Pygal 

 Marginal .. 



Nuchal _ _ . 

 1st Neural 

 2d « 



3d 



4th 



5th 



6th 



7th 



8 th 



9th 



Exact length 

 on crater edge 

 of Carapace. 



12*7 cm 

 7'9 

 8*2 

 7'5 

 7'6 

 8-0 

 8-5 

 9-2 

 9-5 

 9*3 

 9-0 

 8*3 



8'3 



Length. 

 7'5 

 9-5 

 6-5 

 6-5 

 6*5 



(5- ) 

 (4-5) 

 (4-5) 

 (6.5) 

 (2.0) 



Pygal (anterior) . 6 



" (posterior) 6* 



" marginal 7'1 



Length from lower 

 edge of Carapace to 

 union with pleurals. 



6' cm 



6' 



6-1 



6* 



6-4 



6*2 



8-1 

 105 

 10-5 

 11-1 

 11-0 



(7-1) 



Greatest width. 

 14-5 



4-1 



4-7 



4-7 



4-3 



3-7 



3*3 



3*0 

 (3-8) 

 (4-3) 

 16-2 



9-7 



8-3 



