236 



PALAEONTOLOGY OF ILLINOIS. 



Order HEXACTINELLIDA O. Schmidt. 

 Suborder LYSSACINA Zittel. 



Family DICTYOSPONGID.E HalR. 



CLEODIGTYA Hall, 1884 



C. gloriosa Hall 



C. ?mohri Hall... 



RATJFFELLA Ulrich, 1889. 



R. filosa Ulrich 



B. palmipes Ulrich 



CYATHOPHYCUS Walcott, 1879 



C. reticulatum Walcott 



C. subsphericum Walcott 



C. quebecense Dawson 



DICTYOPHYTON Hall, 1863. 



>* 



abacus Hall 



annulatum Hall... 



baculum Hall 



cinctum Hall 



conradi Hall 



D. cylindricum Whit field. 



D. fenestratum Hall 



D. filitextile Hall 



D. hamiltonense Hall 



D. irregulare Hall 



D. nodosum Hall 



parallelum Hall 



patulum Hall , 



prism aticurn Hall 



D. 

 I). 

 D. 



D. ? redfieldi Hall. 



: In the 35th Regt. Eept., Prof. Hall defines the family and a number of genera which 

 he proposes to place in it. At this time I am not prepared to offer an opinion as to the 

 validity of the proposed genera, nor of the numerous species which accompany them. 



