﻿PLATE XXIII. 



Sif/illaria vascularis, Binney. 



Fig. 1. Another transverse section of No. 44, from a different part of the specimen, 

 showing the pith and internal radiating cylinder. Seen by transmitted light. Magnified 

 8 diameters. 



Fig. 2. Transverse section of a portion of the external radiating cylinder, composed 

 of elongated cells (prosenchyma) and parenchymatous tissue, traversed by four bell- 

 shaped orifices, by which the vascular bundles communicated with the rootlets. Mag- 

 nified 8 diameters. 



Fig. 3. Longitudinal section of the pith of small barred cells containing large 

 barred tubes or utricles, and the internal radiating cylinder of barred tubes. Magnified 

 8 diameters. 



