237 



D. rude Hall 



D. sacculns Hall 



D. telumHall 



D. tenue Hall 



D. tuberosum Conrad 



ECTEXODICTYA Hall, 1884. 



K. burlingtonensis Hall 



E. eccentrica Hall 



E. expansa Hall 



E. implexa Hall 



LYRODICTYA Hall, 1884 



L. romingeri Hall 



PHEAGMODICTYA Hall, 1884 



P. catilliformis Whit field. 



P. lineata Hall 



P. patelliformis Hall 



PHYSOSPONGIA Hall, 1884. 



P. alternata Hall 



P. colletti Hall 



P. dawsoni \Vhitfield sp. 



THAMNODICTYA Hall, 1884 



T. newberryi Hall 



UPHANT.ENIA Vanuxem, 1843. 

 U. chemungensis Vanuxem 



Protospongia Salter, 1864 



P. fenestrata Salter 



P. ? minor Matthew 



P. ? minor var. distans Matthew 

 P, tetraneina Dawson 



