Notes on the Genera Omospira Lophospira, and Turritoma; with Descriptions of New Proterozoic Species

J. Donald, G. B. Longstaff
1906 Quarterly Journal of the Geological Society  
doi:10.1144/gsl.jgs.1906.062.01-04.28 fatcat:iw5rreu4hrdrlchfmtl64yqcwy