Sanchez and Avalino at the pump. A stream of water six inches wide and an inch 

 through flows from this spring constantly 



gators, and few bones of any single individual were associated. One night a 

 heavy rainstorm caused the Analla to overflow a part of the stream crossing 

 the spring. Next morning there were shells and river turtles in the spring, 

 an example of the way bones probably accumulated in prehistoric times. 



The bones represent at least two genera and five species of sloth, the 

 largest about the size of a black bear, a rodent, a peccary, birds, an alliga- 

 tor, a crocodile and three species of turtle. The fossils are of Pleistocene 

 age and none are turned to stone. Some recent bones are mixed with them. 

 The collection has not yet been prepared and studied, so that at present it 

 would be premature to say what may be the final deductions. The sloths 

 particularly are creatures of South American origin, but whether they 

 reached the island by way of a land bridge or in some other way has not 

 yet been determined. 



The centrifugal pump in action. The canvas covers the center of the spring. It was 

 impossible to work in the combined heat of the midday sun and hot water without shelter 

 228 



