TAB XV. 



Fig. 



1 a -f. Cardita senilis, page 165. 



2 a, b. corbis, var. nuculina, JP. 168. 

 c, d. exigua. 



3 a. b. chamaeformis, p. 167. 



4. orbicularis, p. 167. 



5. scalaris, p. 166. 



6. analis,jo. 168. 



7 a d. Coralliophaga cyprinoides, p. 200. 



b, c. var. elongata. 



d. slightly enlarged view of the hinge. 



8 a d. Chama gryphoides, p. 162. 

 9#, b. Isocardia cor,j. 193. 



10 a d. Erycinella ovalis, jo. 171. 



e,f. Enlarged views of the hinge, showing a central cavity of the 

 ligament. 



The lines indicate the size of the specimens. 



