462 G. M. Ehlers — New Species of Tetracoralla. 



locally bent down into these openings or deflected 

 towards them. The opening of the radiciform process 

 r 3 , fig\ 2, shown at r 3 , fig. 3, is situated on the line of a 

 lainelliform, secondary septum, breaking its continuity. 

 The terminal portion of the septum to the left of r 3 , fig. 

 3, is depressed towards this opening. Because the side 

 of the opening adjacent to this part of the septum is cov- 

 ered by a small, incrusting cham-coral, Holy sites caten- 

 ularia, the possible downward extension of the septum 

 into the inner tube can not be seen. The small, curved 

 part of the septum, shown in fig. 3 between the opening 

 and the broken edge of the calyx, is bent down a consider- 

 able distance into the inner tube. To the left of this 

 segment of the lamelliform septum is a small detached 

 portion of a denticulate, tertiary septum, which is de- 

 flected towards the opening of the radiciform process. 



Fig. 1. 



Fig. 1. — A side view of the type specimen of Heterolasma foerstei, indi- 

 cating the shape of the preserved eoraHum. Natural size. 



Other septa are similarly interrupted and deflected at the 

 openings of the radiciform processes r 2 and r 1 , fig. 2, 

 shown respectively at r 2 and r 1 , fig. 3. The opening at r 1 

 is situated upon the line of a denticulate septum, whereas 

 those at r 2 and r 3 are located upon the lines of lamelli- 

 form septa. The large opening at r°, fig. 3, toward which 

 a few septa are depressed and deflected, was probably 

 formed by the breaking off of a radiciform process. 



The complete calyx probably had a circular margin 

 and was very wide and relatively shallow. Its diameter 

 is estimated as having been about 130 millimeters and its 

 depth between 10 and 15 millimeters. 



The septa are very short and exhibit a bilateral sym- 

 metry. The four principal septa are well shown with 



