44 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 



San Domingo. The depth of water upon this bank is considerably 

 greater than upon similar stretches of the Bahamas. Here and there 

 patches of shallow water are dotted over its surface, but the average 

 depth varies from seven to eleven fathoms. The sea at the time we 

 crossed it was quite rough, and the action of the heavy swell upon that 

 part of the bank must be quite effective. 



Long Island. 



Plate X. Fig. 6 ; Plate XI. Fig. 2. 



From the southwestern side of Exuma Sound extends Long Island, 

 which projects far out from the angle of the bank. The eastern shore of 

 Long Island is made up of a series of seolian hills, with moi'e or less 

 steep faces to the sea. Its highest point is one hundred and fifty 

 feet. The island is narrow, often not more than a mile in width, 

 varying from that to little more than three. It flanks the eastern 

 face of the most easterly extension of the Great Bahama Bank. The 

 100 fathom line is generally within two miles or so of the eastern shore 

 line. South of Clarence Harbor the island forms a long narrow spit, 

 running southeast with the 100 fathom line within a couple of miles on 



^OLIAN HILLS, CLARENCE HARBOR. 



both sides, while off the eastern face of the northei'n part of the island an 

 extensive flat, with less than three fathoms, connects Long Island with 

 the chain of the Exumas. This flat is the continuation of the great flat 

 which extends to the westward of the Exumas and the line of innumer- 

 able small cays forming the western bank of Exuma Sound. On the 

 west side of the island, opposite Clarence Harbor, the bank makes a 

 great sweep, the outer edge, protected by the Jumentos Cays, forming 

 a half-circle nearly to Ragged Island and the northern edge of Co- 

 lumbus Bank. A few small salt ponds, formed in the valleys of the 

 aeolian hills, are found near Clarence Harbor. The general trend of the 

 seolian hills, both north and south of our anchorage, could be readily 

 traced till the low hills disappeared below the horizon. Patches of coral 

 are growing in the harbor, which is protected by small cays from the 

 prevailing winds. 



