204 Systematic Paleontology 



The siDecimens are frequently invested witli a deposit which appears as 

 a dense outer tissue in which no distinct structure is visible and the nature 

 of which is problematical. This species resembles Diphyphyllum integu- 

 rnentum which is abundant in the Decker Ferry of New Jersey. It differs, 

 however, from that species in its inner structure and its more cylindrical 

 corallites. Its generic position is not fully assured. It suggests Diphy- 

 phyllum but the tabulag characteristic of that genus have not been ob- 

 served. This species is abundant in the coral reef of the Favosites helder- 

 hergice var. prcecedens zone. 



Occurrence. — Heldeeberg Formation, Keyser Member. Pinto, Cash 

 Valley, Devil's Backbone, Maryland; Hyndman, Pennsylvania. 



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



Cyathophyllum marylandicum n. sp. 

 Plate XXI, Figs. 1, 2 



Description. — Corallum compound, consisting of branching cylindrical 

 corallites. Exterior bearing distant flattened annulations, between which 

 are faint transverse strise; longitudinally striated by distinct septal fur- 

 rows. Calyx shallow, conical, bearing about 24 subequal septa, some of 

 which reach the center, their upper edges strongly denticulate. Cross- 

 sections show that the septa are very thick, uniting by their outer edges 

 to form a thick wall. Dissepiments present, not numerous, poorly pre- 

 served. 



This species resembles C. schucherti but differs in having fewer septa 

 and dissepiments. The intimate structure is not well preserved in the 

 specimens observed and its generic relations are not assured. It resembles 

 a Diphyphyllum but the tabulge characteristic of the genus have not been 

 observed. 



Diameter of branches, 8 mm. 



Occurrence. — Helderberg Formation, Keyser Member. Keyser, 

 West Virginia. 



Collection. — Maryland Geological Survey. 



