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SMITHSONIAN INSTITUTION
UNITED STATES NATIONAL MUSEUM
PROCEEDINGS
OF THE
UNITED STATES NATIONAL MUSEUM
VOLUME 40
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WASHINGTON
GOVERNMENT PRINTING OFFICE
1911
THE RECENT AND FOSSIL MOLLUSKS OF THE GENUS
CERITHIOPSIS FROM THE WEST COAST OF AMERICA.
By Paul Bartsch,
Assistant Curator, Division of Mollusks, U. S. National Museum.
The first Cerithiopsis known from the west coast of America was
reported by Alcide D'Orbigny in 1840 from Peru. 1 This was fol-
lowed twelve years later by two additional species, discovered by
Prof. C. B. Adams at Panama and described as Cerithium neglectum
C. B. Adams and Triforis infrequens C. B. Adams. 2
In 1857 Dr. P. P. Carpenter published that part of his Catalogue
of Mazatlan Shells which deals with the members of this genus, citing
the following species:
tuberculides Carpenter. sorex Carpenter.
albonodosa Carpenter. convexa Carpenter.
cerea Carpenter. decussata Carpenter.
pupiformis Carpenter. assimilata C. B. Adams.
Of these, C. convexa is now placed in the genus Metaxia. C. decussata
is a Bittium, and Cerithiopsis assimilata Carpenter = Cerithium
assimilatum C. B. Adams must be referred to the genus Seila.
In 1865 Doctor Carpenter described Cerithiopsis intercalaria 3 and
at the same time referred Cerithium bimarginatum C. B. Adams to this
genus. At present both of these species are placed in the genus
Eumeta. In the Supplementary Report on the Present State of Our
Knowledge with Regard to the Mollusca of the West Coast of America 4
Doctor Carpenter published a terse diagnosis of the following species:
Cerithiopsis columna. Cerithiopsis purpurea.
Cerithiopsis munita. Cerithiopsis fortior.
All of these were later more fully described. Three of them,
C. munita, C. purpurea, and C. fortior, are now placed in the genus
Bittium. In 1867 De Folin added another species, 5 Cerithium
destrugesi, which may not belong t