SPONGES. 



233 



TABULAR LIST AND CLASSIFICATION OF 

 AMERICAN PALEOZOIC SPONGES. 



The arrangement in families and orders is provisional, as 

 future investigations will no doubt necessitate changes. Species 

 marked with an asterisk to the left, are described or discussed 

 in this volume. 



~ 



Class SPONGL^. 



Order MONACTINELLIDA Zittel. 

 LEPTOMITUS Walcott, 1886 



L. zitteli Walcott. (This genus is perhaps 

 founded upon the basalia of some Hexac- 

 tinellid sponge) 



BELEMXOSPONGIA Ulrich, 1889. 

 *B. fascicularis Ulrich... 



LASIOCLADIA Hinde, 1884. 

 'L. hindei Ulrich... 



Order TETRACTINELLIDA Marshall. 



HYSTRIOSPONGIA Ulrich, 1880 



h H. carbonaria Ulrich 



29 



