244 ON THE CONSOLIDATED BEACH AT PERNAMBUCO. 
being enormously long and their eyes much larger than in those found 
in the sea. The water in these pools was opaque, which might 
have led to the above singular differences. 
The Presipent asked if the author had ascertained the amount of 
carbonate of lime in the consolidated rocks. 
The AvtHor stated that he could not give the amount; but the 
cementing material in the specimens examined was wholly calca- 
reous. Liais states that the cementing material in some of the 
beaches is partly calcareous and partly siliceous. 
