90 GEOLOGICAL RECONNAISSANCE OF THE DOMINICAN REPUBLIC. 



specialists who made them. Dr. Marshall A. Howe, of the New York 

 Botanical Garden, is preparing a report on the fossil calcareous algae, 

 but the results of his study are not yet available. 



The lists here given are only preliminary, because, although great care 

 has been taken both in the identification of species and in the compilation 

 of the lists, it has not yet been practicable to make monographic studies of 

 the several groups of organisms represented. Many species have not yet 

 been named and further field work will doubtless add greatly to the number 

 already collected, but notwithstanding these limitations much valuable 

 information was procured. The general biologic features of several of the 

 formations have become fairly well known, and when the data are presented 

 in detail they will help still further to solve problems of both local and re- 

 gional geology. 



PALEONTOLOGIC LITERATURE. 



As it is not practicable to illustrate in this volume the fossils mentioned 

 in the tables, it is desirable to give references to the more valuable illustrated 

 reports on the West Indian and Central American representatives of the 

 groups here considered. Three volumes of particular value have appeared 

 during the last few years. They are as follows : 



Carlotta J. Maury, Santo Domingo type sections and fossils: Bull. Am. Paleontology, 

 vol. 5, pp. 165-459, pis. 27-68, 1917. 



T. W. Vaughan and others, Contributions to the geology and paleontology of the 

 Canal Zone, Panama, and geologically related areas in Central America and the West 

 Indies, prepared under the direction of T. W. Vaughan: U. S. Nat. Mus. Bull. 103, 612 

 pp., 154 pis., 25 text-figs., 1918-1919. This volume contains memoirs on fossils as fol- 

 lows: Calcareous algae, by M. A. Howe; Higher plants, by E. W. Berry; Foraminifera, 

 by J. A. Cushman; Echinii, by R. T. Jackson; Bryozoa, by F. Canu and R. S. Bassler; 

 Decapod Crustacea, by Mary J. Rathbun; Cirrepedia, by H. A. Pilsbry; Corals, by T. W. 

 Vaughan. The last paper in the volume is one by T. W. Vaughan summarizing the pale- 

 ontologic data and discussing problems of correlation and of geologic history. 



T. W. Vaughan and others, Contributions to the geology and paleontology of the West 

 Indies, prepared under the direction of T. W. Vaughan: Carnegie Inst. Washington Pub. 

 291, 184 pp., 53 pis., 7 text-figs., 1919. Besides a brief introduction by T. W. Vaughan 

 this volume contains papers on West Indian fossils as follows: Calcareous algae, by M. A. 

 Howe; Foraminifera, by J. A. Cushman; Bryozoa, by F. Canu and R. S. Bassler; Mol- 

 lusks, by C. W. Cooke; Decapod Crustacea, by M. J. Rathbun. 



These volumes contain references to older works. Several other valuable 

 papers on Foraminifera by Doctor Cushman have recently been published. 

 Among these papers are "The American species of Orthophragmina and 

 Lepidocyclina" (U. S. Geol. Survey Prof. Paper 125-D, pp. 39-105, pis. 

 7-35, text-figs., 1920) and "Lower Miocene Foraminifera of Florida" 

 (U. S. Geol. Survey Prof. Paper 120-B, pp. 60-74, pi. 11, 1920). 



The publications here cited, together with the references they contain 

 and the bibliography given on pages 18-25, include nearly all the impor- 

 tant papers on West Indian stratigraphic paleontology. 



