510 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
fications undoubtedly show a high degree of differentiation. The 
author remarks that the teeth on the periphery of the stalk “ evi¬ 
dently facilitate the mounting of the myxamoebae, while those of 
the border and of the cells constituting the upper face of the cupule 
retain the spores, playing an analogous role to that of the teeth of 
Mucor spinosusP Luxuriant cultures further showed occasional 
branching fructifications; the main stalk then bore a verticel of 
three equidistant branches, each similar to the main axis. 
