Zoology 149 



transformation sizes and seasons, and finally the autumn disappearance. The plates 

 and the text figures illustrate the amplexation of each form, the egg masses, the 

 individual eggs, the tadpoles, the transformed examples, and other interesting phases 

 of their life histories. 



No. 291. Contributions to the Geology and Paleontology of the West Indies. 



Octavo, 184 pages, 53 plates. Published 1919. Price $3.50. 

 This book contains the following papers, not sold separately: 



VAUGHAN, THOMAS WAYLAND. Introduction. 4 pages. 



HOWE, MARSHALL A. Fossil Calcareous Algae from the Leeward Islands, upp., 6 pis. 

 CUSHMAN, JOSEPH A. Fossil Foraminifera from the West Indies, n pp., 15 pis. 

 CANU, FERDINAND, and RAY S. BASSLER. Fossil Bryozoa from the West Indies. 



30 pages, 7 plates. 

 COOKE, CHARLES WYTHE. Fossil Mullusca from the Leeward Islands and Cuba. 



54 pages, 16 plates. 

 RATHBUN, MARY J. Fossil Decapod Crustacea from the West Indies. 28 pp., 9 pis. 



T. W. Vaughan in the introduction states the auspices under which the papers 

 presented in this volume were prepared and the general object of the investigations. 



M. A. Howe describes calcareous algae from the upper Eocene of St. Bar- 

 tholomew, the middle Oligooene of Antigua, and the upper Oligocene of Anguilla. 



J. A. Cushman describes Foraminifera from the upper Eocene of St. Bar- 

 tholomew and Cuba, the middle Oligocene of Antigua, the upper Oligocene of 

 Anguilla, the Oligocene of Cuba, and the Miocene of Saint Martin, the Dominican 

 Republic, Jamaica, and Cuba. 



F. Canu and R. S. Bassler describe Bryozoa from the middle Oligocene of 

 Antigua, the upper Oligocene of Anguilla, and the Miocene of Jamaica and the 

 Dominican Republic. 



C. W. Cooke describes Mollusca from the Eocene of St. Bartholomew, the 

 middle Oligocene of Antigua, the upper Oligocene of Anguilla, and the Oligocene 

 and Miocene of Cuba, and brachiopods from the Eocene of St. Bartholomew. 



Miss M. J. Rathbun describes Decapod Crustacea from the Eocene of St. Bar- 

 tholomew and Trinidad, the upper Oligocene of Anguilla, and the Miocene of 

 the Dominican Republic and Trinidad. 



No. 293. TREADWELL, A. L. Leodicidcc of the West Indian Region. Quarto. 

 In press. 



No. 294. MORTENSEN, TH. Studies in the Development of Crinoids. Quarto. 

 In press. 



This paper gives a detailed description of the embryonic development of three 

 new types of Crinoids, and a partial account of that of three other types. Tro- 

 piometra carinata of Tobago, West Indian Islands, was reared from the egg to 

 the fixed stage. The development of Florometra serratissima from Japan is de- 

 scribed, as are also the embryos of the three viviparous Antarctic forms Isometra 

 vivipara, Notocrinus virilis, and Thaumatometra nutrix. 



The importance of this paper is largely due to the fact that our previous 

 knowledge of the development of Crinoids was based on the study of but one 

 genus, Antedon. 



For other works relating to Zoology, see Experimental Evolution, Variation, 

 and Heredity, pages 97-112. 



