PLATE 12 



1. 



2a, 

 3a, 

 4. 

 5. 

 6. 

 7. 

 8a, 

 9. 

 10. 



2b. 

 3b. 



8b. 



Modiolus demlssus plicatiilus Lamarck. New York. 3 Inches, p. 38. 

 Llthophaga blsulcata Orblgny. Sanibel, Florida. 30 mm. p. 38. 

 Lithophaga antlllarum Orblgny. West Indies. 1.5 Inches, p. 38. 

 Llthophaga nigra Orblgny. Bermuda. 23 mm, p. 38. 

 Perlploma Inaequlvalvls Schumacher. Florida. 1.5 Inches, p. 40. 

 Modiolus aborescens Dlllwyn. Sanibel, Florida. 1.5 Inches, p. 38. 

 Thracia conradl Couthouy. Duxbury, Massachusetts. 3.5 inches, p. 

 Crenella glandula Totten. Off Massachusetts. 13 mm. p. 39. 

 Modlolaria corrugata Stimpson. New England. 12 mm. p. 39, 

 Tellina mera Say. Florida. 15 mm. p. 58. 



40. 



174 



