G. JR. Wieland — Upper Cretaceous Turtles. 441 



Figure 9. — Agomphus. Two complementary specimens illustrating plas- 

 tral structure. No. 776, consisting in the hyoplastra and epiplastron, may 

 be doubtfully referred to A. turgidus. No. 775, consisting in the hypoplas- 

 tic and xiphiplastron, is of more uncertain specific reference. Both the 

 specimens are shown exactly f natural size. 



(1) Bone plates. — ep, epiplastron ; en, entoplastron ; hy, hyoplastron ; 

 hp, hypoplastron ; (xiphiplastron not lettered). 



(2) Hornshields. — h, humeral (in part) ; p, pectoral ; v, ventral ; /, femo- 

 ral ; ai, axillary — si, sub-axillary — mi, mesial — and ii, inguinal inframar- 

 ginalia ; (anal hornshield not lettered). 



