PLATE 18 



1. Tivela mactroides Born. West Indies. 2 Inches, p. 52. 



2. Codakia (jagonla) portorlcana Dall. Porto Rico. 7.25 mm. 

 5. Dosinia elegans Conrad. Interior view. 68 mm. p. 51. 



4. Hysteroconcha dlone Llnne ' . West Indies. 35 mm. p. 53. 



5. Mesodesma arctata Conrad. New England, p. 66. 



6. Gafrarlura cerlna C. B. Adams. West Florida. 12 mm. p. 52. 



7. Gemma gemma Totten. New England. 4 mm. p. 55- 



8. Cyrenolda florldana Dall. Boca Celga Bay, Florida. 14 mm. p. 45. 



9. Phacoldes (Parvlluclna) crenella Dall. Florida. 6.5 mm. p. 45. 



10. Telllna tenera Say. New England. 15 mm. p. 58. 



11. Codakia cubana Dall. off Cuban coast In Gulf of Mexico. 18.5 mm. 



12. Chi one granulata Gmelln. West Indies. 24 mm. p. 54. 



13. Pecten (Lyropecten) kalllnubllosus Bayer, off Saint Marks, Florida, In Gulf of 



Mexico. (See Nautilus Vol. 56, p. 110). 



14. Pecten mlldredae Bay. Blscayne Bay to Tortugas; Bahamas. 



May occur In brilliant purple, red or pure white. 37.5 mm. 

 (Cee Nautilus Vol. 56, p. 110), 



lee 



