PREFATORY NOTE 



This paper describes the species of the genus Turritella 

 of the Buda and Georgetown limestones of Texas as a be- 

 ginning of an intensive study of the genus Turritella of 

 the Comanchean and Cretaceous formations of Texas. 



The author is deeply indebted to Professor F. L. Whit- 

 ney for his valuable help and suggestions in the prepara- 

 tion of this paper, and for the use of his private collection 

 of specimens. She also wishes to express her appreciation 

 of Professor Whitney's inspiration and encouragement 

 which led to her paleontological studies. 



ALVA CHRISTINE ELLISOR. 



