-436 G. R. Wieland — Upper Cretaceous Turtles. 



Measurements of Agomphus tardus Type. 

 (Yale Museum Specimen No. 774. Skeletal elements uncrushed.) 



The Carapace. 



Length on straight line 33* cm 



Length over curvature 43*5 ± 



Width (greatest, or over 4th neural) __. 23* ± 



Distance over curvature (greatest) 38* ± 



Projection beyond front end of plastron 1*5 



Projection beyond anal end of plastron 7* 



[Thickness of nuchal (anterior), l'3 cm ; (posterior), 7 mm ; of the 

 2d neural P4 cra ; of the 5th neural l*5 cm . With the exception of 

 the distal extremity of the second pleural, which reaches the great 

 thickness of 2'2 cm , the pleurals are of much the same development, 

 throughout, their thickness being quite nearly indicated by that 

 of the marginals given in transverse section.] 



Bony Plates of Carapace. 





Length on marginal 



Middle length from 





border of 



marginal border of 





carapace. 



carapace to pleurals, 



Nuchal 



5-2 



5-3 



1st marginal 



4' 



43 



2d 



4-2 



4-6 



3d 



38 



.. 



4th 



3-8 



.. 



5th. _ 



_ 4- 



._ 



6th. __ 



4* 





7th. _ 







.. 



8th 



.... 



.- 



9th 



... 



5- 



10th 



3-8 



4-5 



11th 



4-2 



4- 



Marginalo-pygal _ 



... 4* 



3- 





Length 



Greatest width 





(Antero-posterior). 



(lateral). 



Nuchal 



5-2 



7'3 



1st neural 









2d " 



4- 



3-5 



3d " 







4th " 







5th " 



._ 4- 



3-6 



6th " 







7th " 







8th " 



(absent) 



(absent) 



9th " .. 







Pygai --- 



(3-) 





(Lateral length 1st, 2d, and 7th pleurals 9'5 cm , 12 cm , and 8'7 cm 

 respectively.) 



