VII.] 



CATASETUM. 



183 



This irritability, however, is confined to certain parts 

 of the flower. Fig. 129 represents a male flower of 

 Catasetum saccatum, which is also shown in section 

 in Fig. 130. In this figure it will be seen that 

 the pollinium (ped) is curved and in a state of con- 

 siderable tension, but retained in that position by 



FIG. 130. Section of ditto, with all the parts a little expanded. 



a delicate membrane. Now insects alight as usual 

 on the lip of the flower (/), and it will be seen that in 

 front of it are two long processes called antennas (a ri). 

 In some species of Catasetum both these antennae are 



