EXPLANATION OF PLATE VIII. 



Astarte symmetrica Conrad (p. 54). 



Figs. 1, 2. Outer and inner surfaces of a water- worn specimen. 



Astarte Thomasi Conrad (p. 55). 



Figs. 3, 4. Opposite surfaces of a left valye. 

 5, 6. Similar views of a right valve. 

 7. Cardinal view of two valves in position. 



Astarte cuneiformis Conrad (p. 52). 



Figs. 8, 9. Opposite sides of the most perfect fragment obtained. 



10. Copy of Mr. Conrad's figure of the species, showing the entire form. 



Crassatella melina Conrad (p. 60). 



Figs. 11, 12. Two views of a right valve of a large specimen. 

 13. Cardinal view of an entire shell, 



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