219 



EXPLANATION OF PLATE 10 

 Figure Page 



56. Cardita floridana (Conrad) 60 



57. Tenericardia tridentata Say 60 



58. Tenericardia i)eri>lana (Conrad) 61 



59. Chama coiigregata Conrad 61 



60. Chama maceroplijila Gmelin 62 



61. Pseudocliama radians variegata (Reeve) 62 



62. Echinochania cornuta (Conrad) 62 



