Maryland Geological Survey 203 



Cyathophyllum oherxi n. sp. 

 Plate XIX, Figs. 10, 11 



Description. — Corallum simple, conical, slightly curved, apical angle 

 large. Theca annulated by fine concentric lines and shallow constrictions, 

 striated vertically by furrows which mark position of septa. Calyx 

 conical, shallow, its depth ^ to § width, sides ascending. Septa about 65, 

 nearly equal in length, reaching center. Cross-section shows numerous 

 dissepiments between septa, forming vesicles. Exterior vesicles larger. 

 Longitudinal section not observed. Increasing by calicular gemmation 

 and fission. Two individuals only observed, which are attached by the 

 sides due apparently to growth by fission. 



Size of large individual : Diameter of calyx, 23 mm. ; length, 33 mm. 



This species differs from C. clarhi in its much larger apical angle and 

 its larger size. Its exact horizon is unknown. 



Occurrence. — Helderberg Formation. Martin Mountain, Allegany 

 County. 



Collection. — Maryland Geological Survey. 



Cyathophyllum schucherti n. sp. 

 Plate XX, Figs. 5-9 



Description. — Corallum compound consisting of branching cylindrical 

 corallites, branches ascending and diverging at acute angles. Exterior 

 bearing distant annular constrictions between which are faint, transverse 

 strise; striated longitudinally by distinct septal furrows. Calyx shallow, 

 bottom concave, sides ascending, bearing about 40 septa which alternate 

 slightly in strength. Septa denticulate on edges, continued as ridges to 

 center of calyx. 



Cross-sections show primary septa extending to center and alternating 

 with somewhat shorter secondary septa. Vesicles numerous between septa. 

 becoming large toward periphery, inner vesicles smaller ; vesicular tissue 

 extending one-half distance to center, absent in central area. In longi- 

 tudinal sections vesicles appear elongated, their longer diameter ascending 

 obliquely toward exterior. Tabulae not distinctly observed. 



Diameter of large corallite about 10 mm. 



