Mazy¥ck: Mouuusca or SoutH CAROLINA ix 
family of the Naiades, and Bishop Elliott also to the exhaustive 
studies of Mr. Thomas Bland and the Binneys, father and son, 
of our native terrestrial species. 
It was my great good fortune to enjoy for many years an inti- 
mate friendship with that courtly gentleman of the old school, 
Dr. Ravenel, my conchological patron saint, who guided my 
boyish footsteps into an enchanted region where I have found 
beauty and sweet companionship and joy for more than half a 
century. In the genial and generous Professor Holmes I found 
a most sympathetic helper in my later study, and in the years of 
my later manhood the deep learning and ready assistance, which 
he held during his long and useful life ever at the disposal of every 
student, were the source of lasting obligation to Professor Gibbes. 
Beyond the limits of our state came valued help and encourage- 
ment in many ways from Messrs. Thomas Bland, William G. 
Binney, John G. Anthony, Dr. James Lewis, and others, but 
acknowledgement is especially due to Dr. W. H. Dall, of the 
United States National Museum, for willing assistance in the 
determination of critical species, and for reading the present man- 
uscript before publication. 
The references used in this catalog are, in addition to the lists 
of Professor Gibbes and Lieut. Kurtz, and the catalogs of Dr. 
Ravenel mentioned above, mainly Dr. Dall’s Marine Mollusks 
of the Southeastern Coast of the U. S., Bulletin 37, U. S. Na- 
tional Museum, Washington, 1889; his Blake Mollusca, Bulletin 
of the Museum of Comparative Zoology, volume 18, Harvard, 
1889; and his List of Marine Mollusca, Bulletin 24, U. S. Geologi- 
cal Survey, Washington, 1885; and Mr. Henry W. Turner’s 
List of Mollusca in the Hand Book of the State Board of Agricul- 
ture of South Carolina, 1883. Bibliographical data for all refer- 
ences will be found on page 33 in the List of Works cited. 
In listing the Unios I have followed the conclusions of Simp- 
son’s Synopsis of the Naiades, Washington, 1900. I have paid 
but little attention to this family and so am unable to give much 
information regarding the frequency of occurrence of the several 
species in this state. 
