544 



Repoet of the State Geologist. 



4 



structure resembles that of PriLODicTYA. Clathroj^orafrondosa 

 must then be considered as the type of the genus. 



« 



Fig. 104. Clathropora frondosa, natural :8ize. 



Family Acrogenidae. 



This family includes segmented forms, celluliferous on each 

 face, segments narrow, very gradually increasing in width ; mar 

 gins noncelluliferous. It includes the genera Aorcgenia. and 



DiORANOPORA. 



ACROGENIA, Hall. 



(Kept, of State Geologist, p. 51. 1884.) 

 Type, Acrogenia prolifera, Hall. 



(Plate 15, figs. 11-20.) 

 Zoarium segmented, arising from cylindrical rootlets. Two 

 segments proceed from the truncated termination of the preced- 



