ON THE DEVELOPMENT OF TUBULIPORA. 157 



Fig. 31. — T. plumosa. Upper view of the same lobe. Emb. Leve of 

 the distal end of the embryophore. X, Y, and G are the parts similarly marked 

 in Fig. 30. 



Fig. 32. — T. plumosa. A similar preparation of an older ovicell in stage 

 E. The zooecia D project upwards into the floor of the ovicell, and the 

 thickened edge of the terminal membrane is looped over these projecting 

 parts. Emb. Level of the distal end of the embryophore. 



Fig. 33. — T. plumosa. Decalcified preparation of an old ovicell (stage G), 

 with nearly solid embryophore containing numerous secondary embryos. The 

 axial lobe of the embryophore ends in the ooeciostome at o., and gives off 

 another lobe to the right. The main lateral lobe of the right side is only 

 obscurely bifurcated ; that of the left side is divided into five lobes. Z. Proxi- 

 mal part of ovicell, corresponding with a zooecium. Greatest length of solid 

 part of embryophore to tip of most projecting lobe, 2*5 mm. 



Postscript. — Braem's interesting work, "Die geschleclitliche Entwickelung 

 von Plumatella fungosa " (' Zoologica,' Heft 23, 1897), did not appear 

 until after my MS. was in the hands of the printers ; and I am unable 

 to refer further to his observations and conclusions on the present 

 occasioQ. 



