142 BULLETIN : MUSEUM OF COMPARATIVE ZOOLOGY. 



(Plate IV. Fig. 2) shows the southerly extension of the Little Bahama 

 Bank separating the Gulf Stream channel and the Atlantic bight of the 

 Northwest Providence Channel. This line runs across- the bank from 

 Mores Island to Great Abaco, and shows a much steeper sea face off 

 Little Harbor on the Atlantic than off Mores on the Providence Channel 

 slope. The section from No Name Cay south of Green Turtle Cay 

 (Plate VI. Fig. 4) is interesting as showing the line of the oitter ridge 

 of cays and patches, often rising to the surface, and joining the discon- 

 nected parts of the outer reef with the belt of deeper water between it 

 and the inner line of cays of which Green Turtle Cay is one. 



The section from Fowey Rocks to Gun Cay (Plate IV. Fig. 3) across 

 the northern part of the Great Bahama Bank to the Berry Islands shows 

 a much steeper slope off these islands into the Northeast Providence 

 Channel than the western slope off Gun Cay in the direction of the 

 trough of the Gulf Stream. The line across the bank from Royal Isl- 

 and to the Atlantic face of Eleuthera indicates a very abrupt slope both 

 on the channel side and on the Atlantic side, these two slopes being as 

 steep as the slope east of the Berry Islands. 



A section made somewhat farther south (Plate IV. Fig. 4), from Orange 

 Cay across the northern extremity of Andros, the Tongue of the Ocean, 

 Nassau, and that part of the bank lying between it and Eleuthera, shows 

 the same features as the more northern section. The Orange Cay slope 

 is less abrupt than the east and west slopes of the Tongue of the Ocean 

 off Andros and off Nassau. The Atlantic slope off Eleuthera is somewhat 

 less steep than the slope farther north. A section from Salt Cay Bank 

 (Plate IV. Fig. 5) across to the southern part of Andros, to Green Cay, to 

 Harvey Cay, and across Exuma Sound to Cat Island, shows a less abrupt 

 slope on both faces of the Tongue of the Ocean, though steeper than the 

 Santaren slope of the bank. Off Harvey Cay the slope into Exuma 

 Sound is far less abrupt than cither, and the slope from the 1,000 fathom 

 line to the 500 fathom line off the west side of Cat Island is nearly as 

 flat as that on the west side of the Straits of Florida. From the 500 

 fathom line the west face of Cat Island is as abrupt as the east face. 

 The two slopes of Cat Island are, however, both equally abrupt, and as 

 steep as the slopes of the outer Atlantic faces of the bank elsewhere. 



A cross section somewhat farther south (Plate IV. Fig. 6), from the lati- 

 tude of Anguila Island on Salt Cay Bank across the Hurricane Flats, the 

 southern part of the Tongue of the Ocean over to Exuma Island across 

 Exuma Sound, Conception Island, and Watling Island, shows the peak of 

 Conception Island to be one of a ridge in continuation of Cat Island, and 



