Geneea of the ISToRTH American Palaeozoic Bkyozoa. 603 



218 



219 



Fig. 217. Worthenopbra sjnnosa. na,tnrsi\ size. 



Fig. 218. Surface, x9. 



Fig. 219, A. portion of the surface, x28. 



AscoDicTTON, Yine. 

 (Ann. and Mag. Nat Hist., 4th Series, Yol. XIX, p. 463. 1877.) 



Type, AsGodictyon fusiforme. 



" Zooeoia consisting of radially arranged fusiform or bulbous 

 cells, or filiform threads with periodic swellings " 



Fig. 220. Ascodictyonstellatum. A group of vesicles, xl8. 



Rhopalonaeia, Ulrich. 

 (Jour. Cin. Soc. Kat. Hist., Yol. II, p. 26. 1879.) 

 Type, Rhojpalonaria venosa, Ulrich. 

 Cells slender, fusiform, arranged in a single anastomosing 



Fig. 221. Rhopalonaria venosa, tlI?, 



