PLATE 73 



1. Astarte undata Gould, p. 43. 



g. Thyasira gouldli Philippi. p. 45. 



3. Solemya velum Say. p. £5. 



4. Astarte quadrans Gould. 6 mm. p. 43. 



5. Cardium plnnulatum Conrad. 12 mm. p. 49. 



6. Divarlcella dentata Wood. p. 47. 



7. Astarte castanea Say. 23 mm. p. 43. 



8. Laevicardium mortoni Conrad, animal extended. p. 50. 



9. Venerlcardia borealis Conrad, typical form. p. 44. 



10. Ve-nericardia borealis novangliae Llorse. p. 44. 



11. Cr&ssinella mactracea Linsey; much enlarged. p. 43. 



12. Thyasira obesus Verrlll; much enlarged, p. 45. 



13. Crassinella mactracea Linsey. 6 mm. p. 43. 



14. Lucina filosa Stimpson. p. 46. 



