440 SYSTEMATIC PALEONTOLOGY 



Gorallites, circular or subelliptical in cross-section, diameter from 

 2.25 to 5.25 mm. The corallites of young colonies are often larger than 

 those of older ones, the usual diameter for what may be considered a 

 fully developed corallum is about 3 mm. ; separated by solid ccenenchyma 

 excepting on young coralla, the usual distance apart is about 2.5 mm., 

 though it may occasionally be as much as 5 or 7 mm. In some corallites 

 there is considerable basal calcareous deposit, but it does not seem that a 

 cavity is ever completely filled. In young specimens the calicular mar- 

 gins may be considerably elevated; but on old coralla there is only a 

 slightly elevated calicular rim. 



Ccenenchymal surface. In young specimens the coenenchjnnal surface 

 is costate, costae corresponding to all septa, subequal in size, flattish or 

 rounded above and frequently extending directly from one calice to the 

 next, granulations are densely distributed over the surfaces of the costa?. 

 In older coralla the costse are usually, though not always, well marked 

 around the calicular openings, and often may continue for some distance 

 across the ccenenchymal surface. In addition to the costae there may be 

 fine strise. Both cost?e and strige may be flexuous. In places there are 

 neither costse nor striae, but densely crowded granulations. 



Septa, straight or curved, not exsert, in three complete cycles; those 

 of the first and second cycles, of the same size and reach the columella 

 space, those of the third, much shorter and thinner, their inner edges 

 unusually free, but sometimes joined to the sides of the member of the 

 second cycle. The thickness of the septa is variable; they may be fairly 

 thick or may be weak, but are always thick in the thecal ring. There is 

 no appreci§,ble thickening around the columella. The calices are fairly 

 deep, especially on young specimens, and are widely open. The septal 

 lamina3 are narrow at the calicular margin and increase in width as the 

 columella is approached. The septal margins are dentate. The denta- 

 tions are more or less jagged or may be fine; they are irregular in size, 

 form and number. Septal faces possess rather coarse granulations. 



Dissepiments numerous, usually thick. 



Columella, false, weak, poorly developed, formed by the loose fusion 

 of the inner ends of a few principal septa in the corallite axis. 



Very large suites of specimens of this species have been studied. Mr. 



