P L A T E . 5 6 



1. Chiton tuberculatus Llnnd. '6 Inches, p. 25. 



S. Acanthopleura granulata Gmelln. Florida Keys. 2.5 Inches, p. 24. 



3. Ischnochiton papillosus C. B. Adams. Florida Keys. 8.5 mm. p. 23. 



4. Ceratozona rufe,osa Sowerby. 40 mm. p. 23. 

 5a-5d. Ischnochiton flcriaanus Pilsbry. 41 mm. p. 23. 



6a, 6b, 6c. Lepidochiton alba Linn4. New England. 1.5 mm p. 22. 



7a, 7b, 7c. Lepiaochlton marmorea Fabricius. New England. 35 mm. p. 22. 



8a-8d. Lepidochiton ruber Lowe. New i-ngland. 20 mm. p. 22. 



9a, 9b. Iscnnochlton limaciformis Sowerby. 35 mm. p. 23. 



10. Haminoea succinea Conrad. 10 mm. p. 141. 



