264 



BULLETIN : MUSEUM OF COMPAEATIVE ZOOLOGY. 



(A.) Analyses of Brazilian Corals. 

 L. R. Lenox, A7ia!yst. 



(B.) Analysis of the Reef Rock of Ponta do Mangue, 

 State of Alagoas, Brazil. 



R. E. Swain, analyst. 



No. 1. No. 2. 



Calcium oxide (CaO) 46.01 46.03 



Macjnesia (MgO) 6.95 7.05 



Iron (FesOg) 0.85 0.88 



Alumina (AljOg) 0.56 0.59 



Sodium (Na) trace trace 



Carbon dioxide (COj) 42.94 42.96 



Silica (SiOj) 1-27 1.29 



Phosphoric anhydride (PjOg) .... 0.27 0.26 



Chlorine (CI) 0.31 0.28 



Water (HjO) 0.79 0.77 



Total 99.95 100.11 



