182 LIST OF FIGURES. 



VOL. I. PAGE 



27. Comparative size of steel and hemp dredging ropes (Sigsbee) ... 28 



28. Accumulator (Sigsbee) .......... 31 



29. Deck of " Blake," showing winding reel, and winding engine, facing 



bow, dredging boom, ready for dredging (Sigsbee) . . 30, 31 

 29 a. "Blake" deck looking aft, ready for dredging, reeling engine, drum, 



leading block (Sigsbee) ....... 32, 33 



30. Plan of deck of "Blake" (Sigsbee) ....... 33 



31. Scoop net ............ .35 



32. Tow net ............. 35 



33. Sigsbee's gravitating trap (Sigsbee) ........ 36 



III. THE FLORIDA REEFS. (Figs. 34-54.) 



34. Straits of Florida, from Coast Survey charts ...... 52 



35. Distant mangrove islands seen from Mangrove Beach north of slaughter 



house, Key West .......... 54 



36. Coral breccia ............ 54 



37. Coral oolite ............ 54 



38. Map of the Tortugas, from Coast Survey charts ..... 58 



39. Barbados terraces ........... 65 



40. Sections across the Peninsula of Florida ...... 64, 65 



41. Sections across the Florida Reefs, as numbered on Fig. 34 . .66 



42. Coral rock beach, north of Fort Taylor, exposed to the action of waves 



of channel between outer reef and Key West . . . 68, 69 



43. Lagoon formed by promontories and low islands covered with mangroves, 



northeast shore of Key West Island ..... 70, 71 



44. Alacran Reef, Marquesas Keys, and sections across the reef and 



keys ........... 72, 73 



45. Pelagic Porites embryo, greatly magnified ...... 74 



46. Terraces near Fort Charles Light House, Barbados ..... 79 



47. Madrepora prolifera (Agassiz) ....... 80, 81 



48. Porites clavaria (Agassiz) . ....... 82 



49. Udotea flabellata (Agassi/) . . ...... 82, 83 



50. Halimeda tridens (Agassiz) ........ 82, 83 



51. Madrepora palmata (Agassiz) ........ 84, 85 



52. Rhipidigorgia flabellum (Agassiz) ....... 86, 87 



53. Coral sand beach south of Navy Depot, Key West . . . . 88,89 



54. Orbicella annularis (Agassiz) . . . . . . . .88 



IV. TOPOGRAPHY OF THE EASTERN COAST OF THE NORTH AMERICAN CONTI- 



NENT. (Figs. 55-61.) 



55. Atlantic basin, along Eastern United States, from model constructed 



by the U. S. Coast Survey and Hydrographic Office ... 94 



56. Contour map of the western part of the North Atlantic, U. S. Coast 



Survey and Hydrographic Office . . . . . 94, 95 



57. Contour map of the Caribbean Sea, prepared from data furnished by 



the U. S. Hydrographic Office, based on the deep-sea soundings 

 of the U. S. C. S. S. "Blake" and the U. S. F. C. S. "Alba- 

 tross" ........... 98,99 



58. Contour map of the Windward Islands and the adjacent sea (U. S. 



C. S) ............ 100 



59. Contour map of the Gulf of Mexico (U. S. C. S.) ..... 102 



