AGASSIZ: BAHAMAS. 197 



EXPLANATION OF THE PLATES. 



PLATE I. 



Chart of the Bahamas, prepared by the Hydrographic Bureau, Commander C. D. 

 Sigsbee, U. S. N., Hydrographer. 



PLATE II. 



Fig 1. Hogsty Reef, from a sketch sent by Captain W. J. Wharton, R. N, 

 Hydrographer to the Admiralty. A few soundings made by the " Wild 

 Duck " have been added outside the 100 fathom line. 



Fig 2. Longitudinal section across Hogsty Reef, from the 120 fathom point on the 

 east to the 140 fathom line on the west. 



Fig. 3. Transverse section from the 120 fathom line on the north to the 206 fathom 

 point on the south. 



Fig. 4. The same as Figure 2, on a larger scale, to show the slope of the lagoon from 

 the eastern ledge to the main entrance of the lagoon. 



Fig. 5 Section across the lagoon near the eastern ledge. 



Fig. 6. Section across the lagoon to the west of South Cay somewhat to the east of 

 the entrance. 



Fig. 7. Section across the lagoon at its widest part, near the middle. 



PLATE III. 



Charts of the vicinity of three prominent Blue Holes, from sketches kindly sent by 

 Captain Wharton, R. N., Hydrographer to the Admiralty. 

 Fig. 1. Thirty-eight and seventeen fathom holes. These holes are south of the 



eastern extremity of Thunder Channel, Tongue of the Ocean. 

 Fig. 2. Thirteen fathom hole. 

 Fig. 3. Twenty-four fathom hole. 

 The holes in Figures 2 and 3 are immediately north of Blue Hole Point. 



PLATE IV. 



Fig 1 Section across the Straits of Florida, from Jupiter Inlet to Memory Rock, 

 across the Little Bahama Bank to off Pensacola Cay. 



Fig. 2. Section from Hillsboro Inlet across the Straits of Florida and the North- 

 west Providence Channel, to Mores Island and across the bank to off 

 Great Abaco. 



