82 



BULLETIN : MUSEUM OF COMPARATIVE ZOOLOGY. 



It is, like Cay Lobos, built of recent coral sand rock accumulated after 

 the foraiatiou and disintegration of the cays of the bank. It is on 

 the very edge of the bank, and owes its existence to the throwing up at 

 that point of coral sand so as to make an island, the underlying base 

 of which there is every reason to suppose does not differ from that of 

 the other banks of the Bahamas. This we may safel}' infer after an 

 examination of the remaining outcropping islands forming the Double 

 Headed Shot Cays, the Muertos Cays, the isolated islets of the eastern 

 edge of the Salt Cay Bank (Dog Eocks and Damas Cays, etc.), and the 



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Anguila Islands. The shores of Salt Cay are edged with strata inclined 

 to the sea, composed of recent coral rock sand of different degrees of fine- 

 ness, including in some cases excellent examples of coarse heavy breccia. 

 At onother point on the shore we found a mass of broken fragments of 

 Strombus and Turbo of all sizes and shapes, rounded, elliptical, or an- 

 gular, often more or less worn, forming a regular coarse conglomerate. 

 Mixed with this are numerous pieces of bivalves. At other places the 

 fragments of shells have been broken to very small pieces, forming a 

 very fine breccia. 



The Salt Lagoon, which was once the basis of a thriving industry, 

 destroyed by the hurricane of 1866, is separated from the sea by a long 



