PLATE XXVIII 

 PLEURODICTYUM LENTICULARE HALL (PAGES 423, 424) 



FIGURE 1. Lower or epithecal side of specimen ; showing successive 

 alternate gemmation from parent corallite. X 3. 



FIGURE 2. Similar specimen with lines of growth more strongly 

 marked. The order of budding is opposite to that of preceding speci- 

 men. X 3. 



Lower Helderberg Group, Albany county, New York. 



