Chap. XIV.] ALDROVANDA VESICULOSA. 



263 



globules of hyaline matter. Two of the slightly diverging 

 arms are directed towards the circumference, and two to- 

 wards the midrib, forming together a sort of Greek cross. 

 Occasionally two of the arms are replaced by one, and then 

 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. 



Fig. 18. 

 (Aldrovanda veaicnUna.) 

 Upper fiKnr, whorl of leaves (from Prof. Cohn). 

 Lower figare, leaf pressed flat open and greatly enlarged. 



A narrow rim of the broad flat exterior part of each lobe 

 is turned inwards, so that, when the lobes are closed, the 

 exterior surfaces of the infolded portions come into contact. 

 The edge itself bears a row of conical, flattened, transparent 



