216 



EXPLANATION OF PLATE 9 

 Figure ' Page 



48. Pandora bushiana Dall 57 



49. Pandora arenosa (Conrad) 57 



50. Lyonsia floridana Conrad 57 



51. Ljonsia beana d'Orbigny 58 



52. Cuspidaria gemma (Verrill and Bush) 58 



53. Polymesoda floridana (Conrad) 59 



54. Polymesoda floridana protexta (Conrad) 59 



55. Crassinella mactracea (Linsley) 59 



Fig. a. Exterior view. Fig. b. Interior view. 



