1 



PLATE 70 



1. Pollnlces heros Say, showing animal, p. 92. 



2, 5. Acmaea testudinalls amaena Say. p. 75. 



4. Vermicularia splrata Phlllppl. p. 102. 



5. Llttorina obtusata Llnne. 20 mm. p. 99. 



6. Llttorina saxitlle Olivi. 12 mm. p. 99. 



7. Acmaea testudinalls alveus Conrad, profile. 



8. The same, from below, p. 75. 



9. Lepldochiton ruber Lowe. 20 mm. p. 22. 



10. Chaetopleura aplculata Say. 1 inch. p. 23. 



11. Polinices heros Say. p. 92. 



12. Polinices duplicata Say. p. 92. 



8 mm. p. 75. 



