42 ART. 4. A. YASUDA : ON THE 



cubical, or (c) radially elongated. To the first belong* Aciinostemma 

 racemosum, Schizopepon bryonîœfoUiis, var. japonicus, Jlomordica 

 Qiarantia and Gymnostemma cissoides ; to the second, MeloÜiria 

 japonica, Luffa cylindrica, L. acutangula, Citrullus vulgaris, 

 Lagenaria vulgaris, Trichosanthes cucumeroides, T. japonica and 

 T. multiloba ; to the third, Cucumis sativus, C. JTelo, Benincasa 

 ccr'tfera 'and Cucurhita Pepo, the epidermal cells of Cucumis 

 sativus beins: the lon^'est of all the radial diameter exceeding four 

 times the tangential (PJ. V. Fig. 60) ; those of Benincasa cerifera 

 are also characteristic, many of the cells having a tangential 

 septum (PI. V. Fig. 61). 



A superficial view of the epidermal cells shows some variation 



n size, their diameters measuring 0.006-0.055 mm. Actinostemina 



racemosum, j\[omordica Charantia, Gymnostemma cissoides and 



Citrullus vulgaris, for example, being of the maximum size, while 



Cucurhita F<pj and Cucumis sativus are of the minimum size. 



The walls of the epidermal cells of the fruit may be especially 

 thick on the outer side or on the lateral sides, the outer half 

 particularly manifesting an unusual thickening. 3lelothria japonica. 

 Cucumis sativus, C. Melo, Benincam cerifera, Trichosanthes 

 cucumeroides, T. japonica, and T. multiloba belong to the latter ; 

 the remaining species to the former. 



Sfomaffu The numbers of the stomata on the fruit may 



be shown by the following mean values in a square millimetre : 



Luffa cylindrica 60 



X. acutangula 50 



Cucurbita Pcpo 44 



Citrullus vulgaris 37 



Cucumis Melo 31 



