文档介绍：Ci
SMITHSONIAN INSTITUTION
UNITED STATES NATIONAL MUSEUM
PROCEEDINGS
OF THE
UNITED STATES NATIONAL MUSEUM
VOLUME 40
~OY **/* F$£
;per\ i:
rc> /ORE
WASHINGTON
GOVERNMENT PRINTING OFFICE
1911
THE RECENT AND FOSSIL MOLLUSKS OF THE GENUS
BITTIUM FROM THE WEST COAST OF AMERICA.
By Paul Bartsch,
Assistant Curator, Division of Mollushs, U. S. National Museum.
The first Bittium known from the west coast of America was
reported by A. A. Gould Y in 1849, when he described Cerithium
Mosum from the northwestern coast. Unfortunately, Philippi had
used this name for a different species the year previous, thus pre-
occupying the bination. The same year A. T. von Midden-
dorff 2 described the same species as Turritella eschrichtii.
Bittium eschricJiti Middendorff remained the unique representative
until 1857, when Dr. P. P. Carpenter 3 published Cerithiopsis decus-
sata from Mazatlan, Mexico. To these William M. Gabb 4 added
Turbonilla aspera, a fossil species from the Lower Pleistocene of
Santa Barbara, California, in 1861. Bittium nitens, a fourth species,
was described by Doctor Carpenter 5 in 1864, from Cape St. Lucas,
Lower California.
A large number of new forms were listed in the Supplementary
Report on the Present State of our Knowledge with Regard to the
Mollusca of the West Coast of North America, by Dr. P. P. Car-
6
penter in 1864. In this report Doctor Carpenter gives a list of the
shells known to him and adds a few words of diagnosis to the new
forms, which are later fully described in various journals. The
species here listed are:
Cerithiopsis munita, pages 628 and Bittium ? var. esuriens, page 655.
660. Bittium attenuatum, page 655.
Bittium Jilosum Gould = Es c h-
richtii Middendorff, page 655.
i Proc. Bost. Soe. Nat. Hist., vol. 8, p. 120.
2Beitr. Mai. Ross., vol. 2, 1849, p. 68, pi. 11, fig. 1.
a Cat. Mazatlan Shells, 1857, p. 308.
« Proc. Acad. Nat. Sci. Philadelphia, p. 308.
6 Ann. Mag. Nat.