PLATE 12 



1. Modiolus demlssus plicatulus Lamarck. New York. 3 inches, p. 38. 



2a, gb. Llthophaga blsulcata Orbigny. Sanibel, Florida. 30 mm. p. 38. 



3a, 3b. Llthophaga antlllarim Orbigny. West Indies. 1.5 Inches, p. 38. 



4. Llthophaga nigra Orbigny. Bermuda. 23 mm. p. 38. 



5. Perlploma Inaequlvalvis Schumacher. Florida. 1.5 inches, p. 40. 



6. Modiolus aborescens Dlllwyn. Sanibel, Florida. 1.5 inches, p. 38. 



7. Thracla conradl Couthouy. Duxbury, Massachusetts. 3.5 inches, p. 40. 

 8a, 8b. Crenella glandula Totten. Off Massachusetts. 13 mm. p. 39. 



9. Modiolaria corrugata Stimpson. New Eiigland. 12 mm. p. 39. 

 10. Telllna mera Say. Florida. 15 mm. p. 58. 



174 



