ACKNOWLEDGMENTS. 



In acknowledging the obligations we are under to those who have so kindly assisted us, 

 we perform a most pleasant duty. 



To Professor McCrady, our colleague* we are indebted for valuable assistance in de- 

 scribing the Echinodermata of the Pleiocene ; his initials, J. McC, will be found attached 

 to his descriptions. 



Our sincere thanks are due to Dr. Edmund Ravenel, one of the pioneers of Natural 

 History in South Carolina, for a number of fine specimens discovered in the marl-beds at 

 his residence, the Grove ; and for the use of valuable books from his library. 



It would be impossible to specify the numerous obligations we are under to our distin- 

 guished colleague, Professor L. R. Gibbes; his unabated attention to the best interest of 

 the work, and his liberality in devoting his time and talents to our aid, places us under 

 profound obligations to him. 



To the Rev. Professor James W. Miles, we are especially indebted for contributions to 

 our classical descriptions, revisions, and equally valuable aid in the correction of proofs. 



From Dr. R. Leaumont we acknowledge numerous favors, and much valuable infor- 

 mation. 



Our readers will observe that we have dedicated to the Hon. C. G. Memminger a new 

 species of fossil pholas, P. Memmingerl In doing so we have endeavored to show our 

 appreciation of his love of science and learning, and grateful sense of the lively interest 

 manifested by him for the success of this work. 



"We have also dedicated another fossil, a volute, to George A. Trenholm, Esq., by whose 

 liberal aid alone we were enabled to undertake and complete this expensive publication. 



Our thanks are also due; and we most heartily tender them, to the Hon. Mitchell King 

 and the Hon. J. J'. Middleton, who from the first, have evinced the deepest interest in our 

 undertaking. 



From the Hon. Alex. Hasell, Hon. Thomas M. Wagner, Dr. R. W. Gibbes, Edmund 

 Ruffin and Edward McCrady, Esqrs., we received very important assistance, for which we 

 feel extremely grateful. 



In the prosecution of our investigations we were every where received and entertained 

 with that true hospitality and kindness which Carolinians know so well how to dispense, 

 and all seemed anxious to foster and sustain the effort to develop the natural history of 

 this department in our State. 



F. S. H. 



