REPORT OF THE PRESIDENT, 1919. 



31 



No. 281. Papers from the Department of Marine Biology of the Carnegie Institution of Wash- 

 ington. Vol. XIII. Octavo, 128 pages, 19 plates, 3 figures. 

 Speidel, Carl Caskey. Gland Cells of Internal Secretion in the Spinal Cord of 



the Skates. 31 pages, 9 plates. 

 Drew, Oilman A. The Structure and Ejaculation of the Spermatophores of Octopu 



americana. 14 pages, 3 plates. 

 Clark, Hubert Lyman. The Distribution of the Littoral Echinoderms of the West 



Indies. 25 pages, 3 plates. 

 Harvey, E. Newton. Further Studies on the Chemistry of Light Production in 



Luminous Organisms. 35 pages. 

 Gudger, E. W. The Ovary of Felichthys felis, the Gaff-topsail Catfish : Its Structure 

 and Function. 17 pages, 4 plates. 

 No. 283. Case, E. C. The Environment of Vertebrate Life in the Late Paleozoic in North 



America: A Paleogeographic Study. Quarto, vi-(-275 pages, 8 figures. 

 No. 285. Morgan, T. H. The Genetic and the Operative Evidence relating to Secondary Sexual 



Characters. Octavo, 108 pages, 5 plates. 

 No. 286. Weaver. John E. The Ecological Relations of Roots. Octavo, 128 pages, 33 plates, 



58 figures. 

 No. 287. Spoehr, H. A. The Carbohydrate Economy of Cacti. Octavo, 79 pages, 2 figures. 

 No. 288. Castle W. E. Studies in Heredity in Rabbits, Rats, and Mice. Octavo, 56 pages, 3 



plates, 5 figures. 

 No. 291. Contributions to the Geology and Paleontology of the West Indies. Octavo, 184 

 pages, 53 plates. 

 Vaughan, Thomas Wayland. Introduction. 4 pages. 



Howe, Marshall A. Fossil Calcarous Algse from the Leeward Islands. 11 pp., 6 pla. 

 Cushman, Joseph A. Fossil Foraminifera from the West Indies. 11 pp., 15 pis. 

 Canu, F., and R. S. Bassler. Fossil Brj-ozoa from the West Indies. 30 pp., 7 pis. 

 Cooke, C. W. Fossil Mollusca from the Leeward Islands and Cuba. 54 pp., 16 pis. 

 Rathbun, Mary J. Fossil Decapod Crustacea from the West Indies. 28 pp., 9 pis. 

 No. 295. Mohr, O. L., and Chr. Wriedt. A New Type of Hereditary Brachyphalangy in Man. 

 Octavo, 64 pages, 7 pis, 4 figures. 



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Sales of Pubhca- 



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an . gg^igg Qf Year Books, and from sales of all other 



publications for each year since the foundation of the Institution : 



Table showing sales of publications. 



