Plate IV. 



IV. Nearshore shelf, 1 1-26 meters. 

 Fig. 



1. Architedonica nobilis Roding, 1798. Aperture, size- 10 ■ 21 mm. 



2. Cnicihuliim spinosum (Sowerby, 1824). Exterior, size 17 • 14 mm. 



3. Natica broderipiana Recluz, 1844. Aperture, size - 24 > 23 mm. 



4. Polinices reclusianus (Deshayes, 1839). Aperture, size - 24 x 25 mm. 



5. Polinices otis (Broderip and Sowerby, 1829). Aperture, size - 10 ■ 10 mm. 



6. Sinum debile (Gould, 1853). Aperture, size - 8 > 2 mm. 



7. Hexaplex erythrostomus (Swainson, 1831). Aperture, size -95 x 71 mm. 



8. Hexaplex brassica (Lamarck, 1822). Aperture, size -79 x 58 mm. 



9. Strombus gracilior Sowerby, 1825. Aperture, size - 67 x 47 mm. 



10. Nassarius versicolor (C. B. Adams, 1852). Aperture, size -9 x 5 mm. 



1 1. Oliva spicata (Roding, 1798). Aperture, size - 32 x 17 mm. 



12. Mitra erythrogramma Tomlin, 1931. Aperture, size -17x6 mm. 



13. Hormospira maculosa (Sowerby, 1834). Aperture, size -45 x 14 mm. 



14. Anadara obesa (Sowerby, 1833). A. Exterior, B. Interior, size- 22 x 16mm. 



15. Anadara mix (Sowerby, 1833). A. Exterior, B. Interior, size- 19 x 17 mm. 



16. Adrana penascoensis (Lowe, 1935). Exterior, size - 16 ■ 5 mm. 



17. Modiolus eiseni Strong and Hertlein, 1937. Exterior, size - 17 ■ 12 mm. 



18. Crassatella gibbosa Sowerby, 1832. A. Exterior, B. Interior, size - 30 x 18 mm. 



19. Trigoniocardia granifera (Broderip and Sowerby, 1829). Exterior, size -8x7 mm. 



20. Trachycardium panamense (Sowerby, 1833). Exterior, size - 18 :■ 18 mm. 



21. Chlamys tumbezensis (Orbigny, 1846). A. Exterior, B. Interior, size- 15 x 14 mm. 



22. Chlamys circularis (Carpenter, 1864). A. Exterior, B. Interior, size - 33 x 30 mm. 



23. Laevicardium elenense (Sowerby, 1840). Exterior, size- 13 x 12 mm. 



24. Mactra californica Conrad, 1837. Exterior, size - 33 x 23 mm. 



25. Pilar concinnus (Sowerby, 1835). A. Exterior, B. Interior, size - 24 ■ 17 mm. 



26. Chione mariae (Orbigny, 1846). Exterior, size - 30 x 20 mm. 



27. Pandora claviculata Carpenter, 1856. A. Exterior, B. Interior, size - 30 x 12 mm (Broken). 



28. Tellina arenica Hertlein and Strong, 1949. Exterior, size -13x8 mm. 



29. Donax gracilis Hanley, 1845. A. Exterior, B. Interior, size- 18 ■ 7 mm. 



30. Lyonsia gouldii Dall, 1915. Exterior, size -13x6 mm. 



