NEW GENERA OF PALEOZOIC RUGOSE CORALS 



213 



Corallum forming masses composed of slender, elongate, cylin- 

 dric individuals, subparallel, and connected with each other by 

 radiciform expansions; rapidly increasing by calicinal gemma- 

 tion; septa alternating in size; the longer ones continuing nearly 

 to the center; their sides carinated as in Heliophyllum; 

 the margins slightly denticulated. Internally there are usually, 

 in the peripheral region, a single row of small cysts, though in 

 portions of the more robust forms there are occafiionally two rows. 

 The margins of this row of cysts, in a transverse section, give 

 the appearance of a secondary wall. The tabulae are com- 



37 



Fig-. 33 Synaptopliyllum simcoense (Billings). Longi- 

 tudinal section showing single row of cysts, and wide tabulae, enlarged 



34 Transverse section, showing crenulated septa, enlarged 



35 S. b a c u 1 o i d e u m sp. nov. A transverse section showing septa, 

 and vertical rows of cysts resembling an internal wall, enlarged 



36 Transverse section showing radiciform expansion, enlarged 



37 S. s e g r e g a t u m sp. nov. Transverse sections showing coalesc- 

 ing radiciform expansions, enlarged 



38 Eridophyllum rugosum E. and E. A longitudinal section 

 for comparison with Synaptophyllum 



paratively strong, occupying the greater portion of the width of 

 the interior. 



There has been much confusion in regard to the forms now 

 brought together in this genus. Billings (loc. cit.), Davis (Ken- 



