1966 v, 27 p., 2 figs, 6 pls, paperbound.
1966 v, 27 p., 1 folded chart with sections, 1 folded table, 6 plates. Printed wrappers.A surprisingly scarce work with many new species descriptions. The shells are mediocre to rather well-preserved. Published as University of California Publications in Geological Sciences volume 65. Stamp on front wrapper, otherwise a good copy.