PLATE XXVI. 
I'rGS 1-4. Trionyx lepiomitus, fi'agraeiits, the natural size. Pago 44. 
Fig. 1. Left hyposternal, from below; a, from above. 
Fig. 3. Part of the distal end of the costal of the specimen represented by Figs. 1 and 2 ; a, edge view. 
Fig. 4. Eight hyposternal of a second specimen, from below. 
Figs. 5-10. Fragments of Trionyx eariosus, natural size. Pago 44. 
I'lGS. 5-9. Parts found in close connection. 
Figs. 5,6. Proximal ends of costal bones of opposite sides, seen from above. 
Fig. 7. Distal end of a costal bone, from above. 
Fig. 8. A vertebral bone from above ; a, from below. 
Fig. 9. Probable postabdominal bone, from below; a, edge view. 
Fig. 10. Distal portion of costal bone of a second individual, from above; a, distal view. 
Figs. 11-16. Fragments of Trionyx radiilus, natural size. Pigs. 11 and 12 belong to one, the remainder to 
another specimen. Page 45. 
Figs. 1 ,12. Distal parts of costal bones, from above ; 12<i, edge view of Fig. 12. 
Figs. 13,14,15. Fragments of costal bones. 
Fig. 16. A vertebral bone; a, from below. 
