EXPLANATION OF PLATE VIII. 



AsTAKTE SYMMETKICA Conrad (p. 54). 



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



A.STARTE Thomasi Courad (yi. m). 



Figs. 3,4. ()pi>i).site surfaces of a left valve. 

 .5,6. Siiuiliir views of a right valve. 

 7. Cardinal view of two valves in position. 



AsrAHTE cuNEiFuKMis Conrad (p. .52). 



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



U). ('opy of Mr. Conrad's figure of the species, showing the entire form. 



Ckassatella melina Conrad (p. 60). 



Fi(is. U, 12. Two \ iiws of a right valve of a large specimen. 

 IS. Cai-dinal view of an entire shell. 



