EXPLANATION OF PLATE 2. 



EXOGYRA WINCHELLI. 



Fig. 1, interior view of lower valve, natural size. Fig. 2, inside view of upper valve. 

 (See other figiu'es on Plate 3.) 



EXPLANATION OF PLATE 3. 



EXOGYRA WINCHELLI. 



Fig. 1, front view of lower valve, natural size. Fig. 2, outside view of upper valve. 

 (See other figures on Plate 2.) 



EXPLANATION OF PLATE 4. 



OSTREA BLACKII. 



Fig. 1, outside view of lower valve, natural size. Fig. 2, upper view of the same 

 example. 



EXOGYRA FORNICULATA. 



Fig. 3, outside view of lower valve, natural size. Fig. 4, inside view of the same. 



EXPLANATION OF PLATE 5. 



PTERIA SALINENSI8. 



Fig. 1, left side view of natural cast of the interior, natural size. Fig. 2, dorsal 

 view of the same. 



GERVILLIA MUDGEANA. 



Fig. 3, left side view of natural cast of the interior, natural size. Fig. 4, dorsal 

 view of the same. ^ 



EXPLANATION OF PLATE 6. 



THRACXA MY^FORMIS. 



Fig. 1, right side view, natural size. Fig. 2, dorsal view of the same. 



PACHYMYA? COMPACTA. 



Fig. 3, right side view, uatiual size. Fig. 4, dorsal view of the same. 



