2 30 



Explanation of Plate VI. 



Keroeides koreni Wright and Studcr. 



1. Longitudinal section of the apex of a twig. x 150. 



2. Longitudinal section of a twig a little below tip, where the 

 AxencpitJicl has been lost and the cortical layer of the axis 

 has just formed itself. X I 50. 



3. Spicules of the cortical layer of axis. x 1 50 



4. Transverse section of axis, x 150. 



ax axis. nig mesoglcea. 



cc central cord of axis. vis mesentery. 



cx cortical layer of axis. pc polyp cavity. 



cc ectoderm. si solcnium. 



en entoderm. sp spicule. 



lis horny substance. xc Axcnepithel. 

 Ic lacuna of spicule. 



