PLATE XII. 



FIG. 

 1. 



10. 

 11. 

 1:2. 



13. 

 14. 

 15. 

 10. 

 17. 



SIZE. 



Chelone mydas^ (a few days old). Shoulder-girdle (with upper part of scapulae 



removed) and plastron ; upper view . 2 diam. 

 Left Shoulder-bars, and part of plastron ; 



outer view '. . . . do. 



Shoulder-girdle and tenth vertebra ; front 



view . . .do. 



part of fig. 3 . . . do. 



lower part of third long rib . do. 



section of a dorsal rib . . .10 do. 



section through base of coracoids, and con- 

 tiguous part of Plastron . do. 

 transversely vertical section through fore- 

 part of Plastron ' . . do. 



do. through Plastron a little further 

 back ... do. 



(earlier stage), Plastron ; upper view. 

 Spharffis coraiacca z (young). Plastron; upper view. 



Do. (a somewhat older specimen). Pore- 



part of Plastron ; upper view. 

 Trionyx gavgeticus 3 (young). Plastron; upper view. 

 Chelonia * virgata 5 (embryo). Plastron ; upper view. 

 Emys Eurojxsa 6 (young). Plastron ; upper view. 



Testudo ? 7 (embryo). Plastron ; upper view. 



Platemys ? 8 (young). Plastron; upper view. 



Do. 



) From Rathke. 



1 See pp. 133 141. ~ See p. 134. 3 See p. 133. 



* Rathke uses Brongniart's generic term, Chelonia ; I prefer its synonym Chelone ; as the former 

 term is often employed to signify the whole group of the Testudinata. 



5 See p. 134. 6 See p. 135. 7 See p. 135. 8 See p. 135. 



