Maryland Geological Survey 121 



Occurrence. — Romxey Fohjlation, Hamilton' Member. East bank 

 Evitts Creek below Wolfe Mill. 



Collection. — Maryland Geological SuiTey. 



Family CYATHOPHYLLIDAE 



Genus HELIOPHYLLUM Hall 



Heliophyllum sp. 



Plate YII, Fig. 3 



This is a small, Ijroken specimen, the apex of which is wanting; the 

 corallum is simple and apparently rather turbinate in form; thin and 

 wrinkled epitheca; conspicuous septa which apparently do not reach the 

 center; and the center of about the upper half of the individual is appar- 

 ently an open cup which forms the calyx. 



Occurrence. — Eomney" Formation, Hamilton Member. Ernstville. 



Collection. — Maryland Geological Survey. 



Family CYSTIPHYLLIDAE 



Genus CYSTIPHYLLUM Lonsdale 



Cystiphyllum americanum Milne-Edwards and Haime ( ?) 



Plate VIT, Figs. 4, 5 



Cystiphyllum, cylindricum Hall, 1843, Geol. N. Y., pt. iv, p. 209, flgs. 1, 2. (Not 



Lonsdale.) 

 CystipTiyllum. aynericavum Milne-Edwards and Haime, 1851, Mon. Pol. Foss. 



d. Terr. Pal., p. 464, pi. xiii, figs. 4, 4a. 

 Cystiphyllum americanvm Rominger. 1876, Geol. Surv. Mich., vol. iii, pt. ii, 



p. 138, pi. 1, figs, upper tier of plate and right hand one of lower tier. 

 Cystiphyllum americamim, Grabau, 1899, Bull. Buffalo Soc. Nat. Sciences, vol. 



vi, pp. 126, 127, fig. 10 on p. 127. 

 Cystiphyllum vesiculosum Grabau and Shimer, 1906, N. Am. Index Fossils, 



vol. i, p. 63, fig. 93. 



Description. — Corallum simple, elongated, cylindrical to turbinate, 

 straight or slightly curved form ; epitheca thin, but strongly wrinkled 

 concentrically ; calyx moderately deep with faint indications of septal 

 ridges on its sides; irregular vesicular tissue, dense near the wall, coarser 

 near the center. 



