TAB XV. 
Fig. 
1 a—f. Cardita senilis, page 165. 
2 a, 6. »,  corbis, var. nuculina, p. 168. 
ce, d. . oF » exigua. 
SIGO: »  Chameeformis, p. 167. 
4. ,  orbicularis, py. 167. 
5. ~ scalaris, p. 166. 
6. »  amalis, p. 168. 
7 a—d. Coralliophaga cyprinoides, p. 200. 
b,c. Ee 33 var. elongata. 
d. a 53 slightly enlarged view of the hinge. 
8 a—d. Chama gryphoides, p. 162. 
9a, 6. Isocardia cor, p. 193. 
10 a—d. Erycinella ovalis, p. 171. 
e,f. Enlarged views of the hinge, showing a central cavity of the 
hgament. 
The lines indicate the size of the specimens. 
