203 Systematic Paleontology 



between them occupied by niiinerous dissepiments which become more 

 distant towards center of corallite. Longitudinal section shows dissepi- 

 ments intersecting septa so as to produce somewhat elongated vesicles. 

 The outer vesicles are somewhat larger, their longer axes ascending 

 obliquely towards exterior. Vesicular tissue not so well defined towards 

 center of corallite. 



Length, 30 mm.; diameter of calyx, 15 mm. 



Occurrence. — Helderberg Formation, Iveysbr Member. Cumber- 

 land ; Devil's Backbone ; Pinto ; Martin Mountain. 



Collections. — Maryland Geological Survey, U. S. National Museum. 



Cyathophyllum lUDicuLUM Kominger ? 



Plate XIX, Figs. 12-17 



Cyathophyllum radicula Rominger, 1876, Geol. Survey Mich., voL iii, p. 109, 

 pi. xxxix, fig. 3. 



Description. — Simple, conical slightly curved corallite ; frequently bear- 

 ing root-like protusions near apex for attachment to other bodies. Ex- 

 terior annulated by shallow, somewhat irregular constrictions, striated 

 longitudinally by distinct septal furrows. Calyx moderately deep, its 

 shape somewhat variable, in some specimens base broad, concave, sides 

 erect, abruptly expanding at margin, in others the base smaller, sides less 

 erect, producing a more conical opening. Septa about 40 in individuals 

 4 mm. in diameter, nearly equal in length, continued as low furrows upon 

 calyx bottom to center, their edges denticulate. Inner structure not seen. 



Length, 10 to 14 mm. ; diameter of calyx, 2 to 8 mm. 



The individuals observed are somewhat questionably referred to C. 

 radiculum described by Rominger from the Xiagara formation of Iowa, 

 Michigan, and Indiana. It differs from the typical form in its some- 

 what smaller size and less sharply annulated theca. The resemblance is, 

 however, very close. This species is probably a Cyathopliyllum though 

 its inner structure was not observed. 



Its exact horizon is unknown. Probably Keyser member. 



Occurrence. — Helderberg Formation. Xear Cumberland 



Collection. — Maryland Geological Survey. 



