262 ALDROVANDA VESICULOSA. (Cuapr. XIV. 
processes are formed of very delicate membrane lined with a 
layer of protoplasm ; and they sometimes contain aggregated 
globules of hyaline matter. Two of the slightly diverging 
arms are directed towards the circumference, and two 
towards the midrib, forming together a sort of Greek cross. 
Occasionally two of the arms are replaced by one, and then 
Fic. 13. 
(Aldrovanda vesicutosa.y' 
Upper figure, whorl of leaves (from Prof, Cohn.) 
Lower figure, leaf pressed flat open and greatly enlarged. 
the projection is trifid. We shall see in a future chapter 
that these projections curiously resemble those found within 
the bladders of Utricularia, more especially of Utricularia 
montana, although this genus is not related to Aldrovanda. 
A narrow rim of the broad flat exterior part of each lobe is 
