706 INDEX TO VOLUME VIII. 



PAGE. 



Taconic System, Sponges in 216,233 



Tethyopsis Zittel 245 



TABULAR LIST AND CLASSIFICATION OF AMERICAN PALEOZOIC 

 SPONGES 233 



Tetracladina Zittel 223,225,226,231,234 



Tetractinellida Marshall 220,233 



Thamnodictya Hall 237 



newberryi Hall 237 



Trachyum Billings 216, 241 



cyathiforme Billings 241 



rugosum Billings 241 



Trichospongia Billings 216,241 



sericea Billings 241 



Uphantaenia Vanuxem 216,218,237 



chemungensis Vanuxem 237 



dawsoni Whitfleld 218 



Verticillites DeFrance 280 



Zittelella Ulrich and Everett 217.221,222,235,267,275 



( " ?) infelix Ulrich and Everett 271*,274 



" inosculata Ulrich and Everett 235,271 



lobata Ulrich and Everett 235, 270* 



trentonensis Worthen, sp 235,270 



typicalis Uh-ich and Everett 235,268* 



typicalis var. pistilliformis Ulrich and Everett 235, 269* 



typicalis var. subrotunda Ulrich and Everett 235, 269* 



typicalis var. turbinata Ulrich and Everett 235, 269* 



Zoantharia rugosa, affinity to sponges 216 



ERRATA AND ADDENDA. 

 PART II, SECTIONS 3-5. 



Page 211, to the list of genera at the bottom of this page, add: Receptaculites 

 by Defrance; Iscliadites by Murchison; CerionitOS by Meek & Worthen. 



Pages 218, 222, 235 and 250. the name SyriDg'Ophylluw, being pre-occupied, 



should be changed to Syringelasma. 



Page 218, line 18 from bottom, for SollaCJa read Sollasia. 

 Page 221, in foot note, for Stromap toroidea read Stromatoporoidea. 

 Page 233, line 2 from bottom, for 1880 read' 1889. 



Page 235, line 2 from top, for A. mamillata read A. mammulata. 



Page 235, line 10 from bottom, for C. radialis read C. radiata. 



Page 257, line 10 from bottom, for the systems read the canal systems. 



Page 272, line 17 from top, for U. & R. read U. & E. 



Page 273, line 17 and 18 from bottom, exchange former and latter. 



