200 



NEW YORK STATE MUSEUM 



Cyathaxonia. In a transverse section it is crescentif orm ; 

 tabulae present; dissepiments not observed. 



This genus most nearly resembles Menophyllum E. & H., 

 but there is only one septal fovea, and the crescentiform thicken- 

 ing appears only in section and is formed in a different manner 

 from that of Menophyllum. 



Meniscophyllum minutum, sp. nov. 



Corallum minute, horn-shaped, regularly curved; hight about 

 12 mm; diameter of calyx 7 mm; surface with wrinkles of 

 growth and fine concentric striae; calyx oblique, walls thin; 

 septa about 32 in number; the smaller ones rudimentary. The 

 extremities of the septa of the cardinal and lateral aspects be- 

 come thickened and coalesce, forming a. pseudocolumella; septal 

 fovea narrow; tabulae infrequent and very thin. 



Formation and locality: Lower Carbonic, Missouri. 



Fig. 1 Meniscophyllum minutum, nat. size 

 2 Longitudinal section, enlarged 



3, 4 The crescentiform appearance of a transverse section of the pseu- 

 docolumella, enlarged 



DiTOECHOLASMA, geu. nov. 



Type: Petraia fanningana Safford, Geology of Tennessee. 

 1869. p. 329. Helderbergian, Perry co. Tenn. 



Corallum slender, attenuate, very gradually increasing in size; 

 septa alternating in size, the larger ones continuing to or nearly 

 to the center, becoming involved and forming a pseudocolumella, 

 the smaller septa coalescing with the larger ones. The septa are 

 arranged in pairs, each pair separated by a comparatively wide 



