1918] = Packard: Molluscan Fauna from San Francisco Bay 209 
The asterisk following a station number indicates that a part or all 
of the specimens of the designated species from that station were 
determined by Dr. Dall; the dagger indicates those that were deter- 
mined by Dr. Bartsch. 
The known range of the species along the coast has either been 
compiled or has been taken directly from an author to whom eredit 
has been duly given. The recent paper by Dall (1916a) has been 
made the basis of the range of the Pelecypoda. The range of the 
Gastropoda is as yet less well known. 
Charts have been prepared showing the local distribution of eight- 
een of the more common species. Localities at which a particular 
species was taken alive are indicated on an outline map of San Fran- 
cisco Bay by a dot, while those at which only shells were taken are 
indieated by a cirele. 
The illustrations of the species are reproduced from photographs 
taken by Mr. H. Hollinger and retouched by Mrs. Louise Nash. In 
a few instances specimens from near-by localities have been substituted 
for the poor ones represented in the collection of the Survey. Such 
cases are noted in the explanation of the plates. 
This study has been pursued under the direction of Professor 
Charles A. Kofoid, to whom the writer is greatly indebted for many 
suggestions and criticisms. Gratitude is due Dr. Francis B. Sumner 
for his criticisms of the paper and for valuable assistance given during 
the progress of the work. The author wishes to acknowledge his 
indebtedness to Dr. William H. Dall, who has reviewed the manu- 
seript, and who together with Dr. Paul Bartsch has determined speci- 
mens representing nearly the complete fauna. Mr. Waldo L. Schmitt 
and Mr. Edward C. Johnston as naturalists on the ‘‘ Albatross’’ have 
assisted the writer in many ways. 
REVIEW OF THE LITERATURE 
The conchological literature contains many references to San Fran- 
cise} Bay and immediate vicinity, scattered through foreign and 
American papers. A number of exploring expeditions entered the 
bay of San Francisco in the early part of the last century. Their 
biological collections were often studied in Europe, and consequently 
a considerable number of our local mollusks has been described by 
foreign authors. 
These early papers were carefully reviewed by Philip P. Carpenter 
(1856a) in a paper entitled, ‘‘Report of the present state of knowl- 
