PLATE 17 



1. 



2. 



3. 



4a, 



5a, 



6. 



7. 



Cardlum murlcatum Llnne. Sanibel, Florida. 35 mm. p. 49 



Cardliom robustum Solander 

 Cardium isocardium Lirme. 

 4b. Laevlcardium mortoni Linn6. 

 5b. Trlgonlcardla medium Linn6. 

 Cardium ciliatum Fabriclus. 

 Laevicardium serratum Linn6 

 8a, 8b, 8c. Papyridea spinosum Meuschen 

 9. Papyridea semisulcata Gray. 



Sanibel, Florida. 5 inches, p. 49. 

 Florida. 3 inches, p. 48. 



Tarpon Bay, Florida. 1 inch. p. 50. 

 Florida Keys. 3.5 inches. ?. 50. 

 New England. 2 inches. _ p. 49. 

 Biscayne Bay, Florida. 1.5 inches. 

 Florida. 8-16 mm. p. 49. 

 Yamato, Florida. 10 mm. p. 49. 



p. 50. 



10a, 10b. Trigonicardia antillarum Orbigny. Bahamas. 20 mm. p. 49. 



