72 



NOTES ON DIPTEROCARPS. 



The normal cotyledons are not markedly unequal : the outer 

 occupies rather more than one half of the circumference of the 

 embryo as seen with the radicle away from the observer, and just 

 shuts out the placentar cotyledon from the apex of the fruit: but 

 occasionally it may much outgrow it. For cases of nearly equal 

 cotvledons see figures 171-179. 



'8C. 

 lit. 



Ffgure 171, an embryo of the variety of Shorea Curtisii figured above as 

 165, viewed with the radicle away from the observer ; figure 172, the outer 

 cotyledon from outside ; and figure 173, the inner cotyledon from the face away 

 from the outer cotyledon ; figure 174, the naked embryo of the variety drawn 

 above as figure 170, viewed with the radicle away from the observer : and 

 figure 175, the outer cotyledon of the same from outside ; and figure 176, the 

 inner cotyledon from the side away from the outer cotyledon ; figure 177, a 

 naked embryo of the same variety as figure 170 viewed with the radicle away 

 from the observer ; and figure 178, the outer cotyledon from outside ; and 

 figure 179, the inner cotyledon from the side away from the outer cotyledon. 

 All \ nat. size. 



Figures 180 to 185, outlines of the cotyledons of three seedlings of Shorea 

 Curtisii showirg varying degrees of disparity between the cotyledons, the outer 

 eotyledon is the upper of each pair. All \ nat. size. 



Four cases are shown in figures 167 and 168 in which the placen- 

 tar cotyledon failed to lie against the placenta in a normal way 

 but had, as it were, got across it, so that the placenta had left a 

 shallow impression upon the face of the cotyledon, — a slight groove 

 like the grooves seen in Shorea costata, and the result of pressure. 

 These abnormalities were not accompanied by the presence of any 

 twin seed. Again an abnormality is figured in figure 169 in which 

 the lobes of the cotyledons had grown unequally. 



Perhaps because I have found so many more thousands of its 

 seeds and seedlings on the hills of Penang than of other Shoreas, 

 I have found such abnormalities in it only. 



Jour. Straits Branch 



