18 DR. ERIC DRABBLE ON 
In some cases the midrib became extinct before reaching the 
lateral suture; in others it fused with the marginal vein of 
the upper carpel. At the same time the distal quadrangular 
seetion of the fruit gave way proximally to a triangular form. 
Fig. 2. 
In these specimens the fusion of the two carpels was nearly 
complete, only the distal extremities being free. 
Finally, a single specimen (fig. 6) was met with exhibiting the 
triangular cross-section throughout. That we are not here 
dealing with a tricarpellary fruit, as might at first sight be 
