! ' The skull of a land Tortoise (Tntmb depkattopiu). 



In the true Tortouea the temporal depressions are exposed, u in the Terrapenrt : the hra*l 

 U proportionally nnall and can be withdrawn beneath the protective roof of the carapace. 

 The ikoll u rounder and lea* depreaied than in the Terraprnn : the frontal* enter into thr 

 formation of the orbital border. The tympanic hoop u notched behind, but the coltimrlli- 

 tonii stapes paastl through a mall foramen. The palatine processes of the maxillariat are 

 on a plane much below that of the continuation of the basis cranii formed by the romer and 

 palatine*. 



/f valerian. 



1050. The left moiety of the vertically bisected cervical vertebrae of a marine Turtle 

 (Cliioiie). 



The hypapophysis of the atlas support! a much smaller proportion of the neural arch than 

 the true centrum or ' odontoid ' does. In the second and third vertebrae the centrum is 

 convex before, concave behind. The body of the fourth cervical is biconvex ; that of thr 

 fifth is concave before and flat behind ; in the three following the body is couvex behind. 



J/HHferia*. 



1060. The left moiety of the vertically bisected cervical vertebra; of a Tortoise (Tes- 

 huto). 



The second vertebra is couvex in front, concave behind ; the third is biconvex ; the next 

 three are concave in front and convex behind ; the seventh is biconcave. 



Hmtteria*. 



1061. The right scapula and acromial process of a Turtle (Chelone). 



\ 



1062. The right coracoid of the same Turtle. 



1063. The left scapula and acromial process of the same Turtle. 



1064. The left coracoid of the same Turtle. 



1065. The right scapula and acromial process of a mud Tortoise (Trionyt). 



1066. The right coracoid of the same Trionyx. 



1067. The left scapula and acromial process of the same Trioayx. 



2o2 



