PLATE 30 



180 



175. Oxyhemoglobin of the Hippopotamus (Hippopotamus niii/iliiliiiia}, shutting smaller prismatic 



iintwiiineil crystals, some tabular, some resembling rhombohedra and some lunger prismatic. 



176. Same, showing smaller prismatic type of crystals, some twinned. 



177. Same, showing trapezoidal form of horse-type twin. 

 17S. Same, showing large twinned aggregates. 



179, ISO. Same, showing apparently hemimorphic crystals produced liy elongated (wins of trapezoidal 

 horse-type. 



