CONTENTS. 



Page. 

 I. In Memoriam: George Harold Drew. By Alfred G. Mayer 1 plate i-6 



II. On the Precipitation of Calcium Carbonate in the Sea by Marine Bacteria, 

 and on the Action of Denitrifying Bacteria in Tropical and Tem- 

 perate Seas. By G. H. Drew 2 maps, 4 figures 7-45 



III. Preliminary Remarks on the Geology of the Bahamas, with Special Refer- 



ence to the Origin of the Bahaman and Floridian Oolites. By T. 

 Wayland Vaughan 47-54 



IV. Building of the Marquesas and Tortugas Atolls and a Sketch of the Geologic 



History of the Florida Reef Tract. By T. Wayland Vaughan. . 55-67 



V. Some Chemical Characteristics of Sea-water at Tortugas, Florida. By 



R. B. Dole 69-78 



VI. Observations upon the Growth-rate and CEcology of Gorgonians. By L. R. 



Gary 2 plates 79-90 



VII. Growth-Changes in Brittle-Stars. By H. L. Clark 3 plates 91-126 



VIII. The Early Influence of the Spermatozoan upon the Characters of Echinoid 



Larvae. By D. H. Tennent n figures 127-138 



IX. Studies of Jamaica Echini. By Robert T. Jackson 21 figures 139-162 



X. The Spermatogenesis of the Mongoose; and a Further Comparative Study 

 of Mammalian Spermatogenesis, with Special Reference to Sex 

 Chromosomes. By H. E. Jordan i plate, 9 figures 163-180 



XI. Bryozoa of the Tortugas Islands, Florida. By R. C. Osburn 23 figures 181-222 



