ipisl /. Arthur Harris and Ross Aiken Gortner 79 



EXPLANATION OF PLATE 3 



Diagrams illustrating the nature of the type of prolification of the fruit of 

 Passiflora gracilis, considered in this paper. 



(A) Form of the normal fruit, showing three of the six external sutures. 



(B) External appearance of extreme case of prolification, showing the wall 

 distended by the large included mass. 



(C) Gross section of the fruit wall, showing the three placentae, with 

 funiculi, f rom which the seeds have been detached. Externally these are repre- 

 sented by three sutures. Three other sutures alternate with these, completing 

 the six which are found in the normal fruit and in this type of prolification. 



(D) Longitudinal half of a proliferous fruit, showing one placenta and the 

 line of one of the intermediate (dorsal) external sutures, which is but faintly 

 visible internally. The stalked prolification with three of the four external 

 carpels visible is of typical size. With the exception of the presence of the 

 prolification, the diagram is quite typical of the normal fruit. 



(E) A rather small carpellary mass seen from above, exhibiting the pro- 

 nounced tetramery of the included mass in f ruits of this class. 



(F) Unusually large prolification, showing the internal whorls of carpels 

 greatly developed and projecting beyond the tetramerous whorls, of which 

 three members are visible. In figures D, E, and F, note the well developed styles 

 and Stigmas. All figures are about twice natural size. 



