Bulletin 29 166 



esting living river crabs and other Crustaceans, and various Rep- 

 tiles, including a new species of snake and some curious lizards. 



The fossil Crustacea, Echinoids, Corals, Bryozoa, and Fora- 

 minifera were sent to Dr. Vaughan to be submitted for identifi- 

 cation to experts in the different groups. He himself very kindly 

 undertook the corals, Miss Rathbun the Crustacea, Dr. Jackson 

 the Echinoids, Messrs. Bassler and Canu the Bryozoa, and Dr. 

 Cushman the Foraminifera. In return for this kindness the ma- 

 terial was loaned to the United States Geological Survey for in- 

 corporation in various forthcoming reports. 



Thus it will be seen that the Expedition has contributed 

 new and interesting material for many lines of research. 



Our collection of Molluscs was supplemented by a loan .of 

 unnamed Santo Domingo specimens from the American Museum. 

 This gave an additional locality for correlation. 



Of greatest value in making the identifications was the Gabb 

 collection of the Paleontological Museum, Cornell University, 

 which included a large number of metatypes. 



The order followed in this memoir is that in which the work 

 was actually done. The material was collected and very critic- 

 ally examined and classified. In accordance with this, Part I 

 will be devoted to Mollusca, Part II to Stratigraphic Deductions 

 made from the study of the various classes of organic remains. 



The author is grateful to Dr. Dall for his aid in certain per- 

 plexing identifications; to Dr. Vaughan for his personal interest 

 in the corals and for the distribution for study of the various 

 groups of fossils among his colleagues and assistants; to Dr. 

 Reeds for the loan of the American Museum collection; to Pro- 

 fessor Berry for identifying the plants; and to Professor Harris, 

 who has been a never failing inspiration and mainstay. 



For greatly facilitating the progress of the Expedition the 

 writer is much indebted to the kindness of Mr. Arthur Sewall, 

 Hon. W. A. Maury, Professor Grabau, and Ambassador W. W. 

 Russell. 



