THE TERTIARY FORMATIONS OF VIRGINIA. 377 



DESCRIPTION OF THE PLATES, 



PLATE XXVI. 



Figure 1. Turritella ter-sfriata. 



Figure 2. Turritella quadri-striala. 



Figure 3. Natica perspectiva. 



Figure 4. Fissurella catilliformis. 



Figure 5. Area protrada. 



Figure 6. Lucina speeiosa. 



Figure 7. Venus cortinaria. 



PLATE XXVII. 



Figure 1 . Ostrea sinuosa. 

 Figure 2. Cytherea ovata. 



PLATE XXVIII. 



Figure 1. Cytherea lenticularis. 

 Figure 2. Cucullea onochela. 



PLATE XXIX. 



Figure 1. Cucullea transversa. 

 Figure 2. Venericardia ascia. 



PLATE XXX. 



Figure 1 . Cardium quadrans. 

 Figure 2. Crassatella capri-cranium. 

 Figure 3. Fasciolaria rhomboidea. 



