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SMITHSONIAN INSTITUTION
UNITED STATES NATIONAL MUSEUM
PROCEEDINGS
OF THE
UNITED STATES NATIONAL MUSEUM
VOLUME 39
WASHINGTON
GOVERNMENT PRINTING OFFICE
1911
—:
THE RECENT AND FOSSIL MOLLUSKS OF THE GENUS
DISASTOMA FROM THE WEST COAST OF AMERICA.
By Paul Bartsch.
Assistant Curator, Division of Mollushs, U. S. National MuLseum.
Of this genus only a single species has been reported from the west
coast of America, Bittium fastigiatum Carpenter. This was tersely
diagnosed by Dr. P. P. Carpenter in his report on the Mollusks of the
West Coast of America, made to the British Association for the Advance-
ment of Science in 1863, and published in their report on page 655 in
1864. Later, in 1865, it was more fully described in the Annals and
Magazine of Natural History, page 181. This species was collected
by Col. E. Jewett in the Lower Pleistocene deposits at Santa Barbara,
California.
To this I now add three additional species, Diastoma chrysalloidea
Bartsch, from the Gulf of California; Diastoma oldroydx Bartsch, from
San Pedro, California, and Diastoma stearnsi Bartsch, from San Diego,
California.'*
DIASTOMA FASTIGIATA Carpenter.
Bittium fastigiatum Carpenter, Rep. Brit. Ass. Adv. Sci. for 1863, 1864, p. 655;
Ann. Mag. Nat. Hist., eer. 3, vol. 15, 1865, p. 181.
Shell elongate-conic, yellowish white. Nuclear whorls two, well
rounded,