Plate I. 



I. Intertidal and shallow rocky shores assemblage. 

 Fig. 



1. Littorina aspcra Philippi, 1846. Aperture, size - 20 x 13 mm. 



2. Nerita scabricosta Lamarck, 1822. Aperture, size - 43 x 40 mm. 



3. Turbo fliictuosus Wood, 1828. Aperture, size -31 x 30 mm. 



4. Turbo saxosus Wood, 1828. Aperture, size -16x15 mm. 



5. Cerithium stercusmuscarum Valenciennes, 1833. Aperture, size - 26 x 11 mm. 



6. Vermicularia pellucida (Broderip and Sowerby, 1829). Aperture, size - 16 x 9 mm. 



7. Pyrene fuscala (Sowerby, 1832). Aperture, size- 18 x 11 m. 



8. Purpura patula pansa Gould, 1852. Aperture, size - 37 x 24 mm. 



9. Jenneria pustulata (Solander, 1786). A. Dorsal, B. Aperture, size - 16 x 10 mm. 



10. Siphonaria maura Sowerby, 1835. A. Dorsal, B. Interior and animal, size -7-8 mm. 



1 1. Arcopsis solida Sowerby, 1833. A. Exterior, B. Interior, size -12x7 mm. 



12. Isognomon cheninilzianus (Orbigny, 1853). A. Exterior, B. Interior, size - 33 ■ 23 mm. 



13. Cardita affinis californica Deshayes, 1854. A. Exterior, B. Interior, size - 65 x 28 mm. 



14. Anomia adamas Gray, 1850. A. Exterior, B. Interior, size -32 x 27 mm. 



