Citations containing new species:

• Gabb, W. M., 1864. Geol. Surv. Calif.. Palaeont., 1 (sect. 4 ).
• Gabb, W. M., 1868. Amer. Jour. Conch., 4. (677.92 KB)
• Gabb, W. M., 1872. J. Acad. Nat. Sci. Phila., (2) 8 (4 ). (1.85 MB)
• Gabb, W. M., 1873. Trans. Am. Philos. Soc., new series, 15. (813.38 KB)