446 



W. DE MORGAN AND THE LATE G. HAROLD DREW. 



plant having a hollow stem, the enteric cavities lined with the endoderm 

 cells of the individual hydranths corresponding to the vascular bundles 

 of the plant. 



A view of a cross section through a stem of Antennularia raniosa is 

 shown in Fig. 1. Externally it is limited by the structureless perisarc, 



end.twb. 



ect.- 



Fig. 1. X 175. — Section of portion of normal ccenosarc, showing coenosarcal con- 

 tinuations of tubules continous with the enteron of individual polyps. End. tub., 

 endoderm tubules ; p., perisarc ; ect., ectoderm cells. 



within this is a somewhat indefinitely arranged mass of slightly elon- 

 gated cells with small but sharply staining nuclei ; of these the cells in 

 immediate contact with the perisarc are larger than the others, which 

 appear to be tightly packed together. At regular intervals within this 



