S22 Report of the State Geologist. 



Base and lateral margins greatly thickened. Branches connected 

 hy dissejpiments : 



FOLIAOEOTJS. 



Cell apertures in two ranges ; median 



carina Lykopokina. 



Cell apertures in two and three ranges ; 



with or without carina Ltkoporella.. 



Cell apertures in more than two ranges ; 



no median carina Ltropoea. 



Cell apertures in four ranges ; median 



nodes or carina Lyroporidea. 



Branches connected hy anastomosis : 



Cell apertures in more than two ranges ; 

 no median carina Anastomopora. 



Forms with central axis ; growth spiral : 



Cells in two ranges ; median carina ..... Archimedes. 

 Cells in more than two ranges; no 



median carina Archimedipora. 



Growth spiral / no central axis : 



Cells in two ranges ; median carina . , . . . Helicopora. 



Family Acanthocladiidae. 

 The forms included in this family have a flattened stipe, from 

 which proceed numerous short lateral branchlets and occasionally 

 a larger branch having the same manner of growth as the main 

 stipe ; cellulif erous on one side only ; branchlets not connected by 

 dissepiments. The following genera are included in this family : 

 Acanthocladia, Gtlauconome, Iohthyoraches and Ramipora. 



Aoanthocladia, King. 

 (Ann. and Mag. Nat. Hist , 2d series, Yol. Ill, p. 389. 1849.) 



Type, Acanthocladia anceps^ King. 



Original diagnosis. " A Thamniscidia ; stems symmetrically 

 and bilaterally branched ; more or less on one plane ; rarely 



