BULLETIN OF THE GEOLOGICAL SOCIETY OF AMERICA 



Vol. 26, pp. 349-374, PLS. 10-15 AUGUST 17, 1915 



PROCEEDINGS OF THE PALEONTOLOGICAL SOCIETY 



STUDIES OF THE MOEPHOLOGY AND HISTOLOGY OF THE 

 TEEPOSTOMATA OR MONTICULIPOROIDS ^ 



BY E. R. CUMINGS AND J. J. GALLOWAY 



(Read before the Paleonlological SocicUj Deceinher 31, 19 IJ/) 



CONTENTS 



Page 



lutroducLioii 349 



Cysts and cystiplu-agin.s 350 



In general 350 



Infimdihular diaphragiiis 351 



Cysts and brown bodies 351 



Alternative explanations 353 



Communication pores 356 



Intrazocecial spines 358 



Wall structure 358 



Integra ta and amalgamata 358 



Histology of the walls and tlic median line 359 



The ciiigulum 361 



Acanthopores 363 



Merlia noriiiani Kirkpatrick 364 



Summary and conclusions 365 



T'.ililiograiiliy .366 



lOxpl.iiiatioH of jilates :]QQ 



Introduction 



The rt'sults recur<le(l in the present papei- are the by-])ro(luct of studies 

 i)egun liy tlie senior author in 18!»9, and since 1908 sliared by both au- 

 thors on even terms. At first dur interest in the order was ahnost entirely 

 faunistie and systematic;, but as these studies were pushed further it be- 

 came more and more evident that a much nioi'e detailed and minute 

 examination of trepostome structure was necessary to the proper elucida- 

 tion of generic and family relatiiiiishi|)s. It was necessary, liowevcr. first 

 of all, til lii'iiig to a conclusive issue the vexed question of the .systematic 

 j)osition of ibe group, and failiiiL:" this from the direction of nioi-pliolngv 



1 Manuscript received by the Secretary of the Society April 3, lOlIi. 



(349) 



