Plate VI. 



\'I. Outer shelf, southern gulf, clay bottom, 66-1 20 meterr. 

 Fig. 



1. Crucibiilum, n. sp. A. Exterior, B. Interior, size -31 -27 mm. 



2. Nassarius catallus Dall, 1908. Aperture, size - 17 :■ 10 mm. 



3. Conus arcuatus Broderip and Sowerby, 1829. Aperture, size - 40 ■ 20 mm. 



4. Anadara mazatlanica (Hertlein and Strong, 1943). A. Exterior, B. Interior, 

 size - 42 V 27 mm. 



5. Chione kellettii (Hinds, 1845). A. Exterior, B. Interior, size -53 x 43 mm. 



6. Pitar mexicamis Hertlein and Strong, 1948. A. Exterior, B. Interior, size - 50 x 40 mm. 



7. Periploma carpcnteri Dall, 1896. A. Exterior, B. Interior, size - 30 x 42 mm. 



VII. Outer shelf, northern gulf, sand bottom, 66-1 20 meterr. 



8. Polinices intenieratus (Philippi, 1853). Aperture, size -9 ;■ 9 mm. 



9. Strombus graniilatus Swainson, 1822. (Pliocene?). Aperture, size - 69 ■ 43 mm. 



10. Cymatium amidum (Reeve, 1844). Aperture, size - 34 x 18 mm. 



11. Pleuroliria nobilis (young) (Hinds, 1843). Aperture, size -32 x 17 mm. 



12. Pleuroliria oxytropis (Sowerby, 1834). Aperture, size -19x6 mm. 



13. Glycymeris fessellata (deep form) (Sowerby, 1833). Exterior, size - 25 > 25 mm. 



14. Lucinonuj ammlata (Reeve, 1850). A. Exterior, B. Interior, size - 43 > 38 mm. 



15. Nemocardiuru centifilosum (Carpenter, 1864). A. Exterior, B. Interior, size - 10 ■ 9.5 mm. 



16. Macorna lamproleuca (Pilsbry and Lowe, 1932). A. Exterior, B. Interior, size - 36 ;■ 21 mm. 



17. Corbula ventricosa Adams and Reeve, 1850. Exterior (whole), size- 11 x 7mm. 



