206 Systematic Paleontology 



Genus HELIOPHYLLUM Hall 



Heliophyllum cf. CORXICULUM Lesueur 



Plate XXI, Figs. 3 -(5 



Caryophyllia cornicula Lesueur, 1820, Mem. du Mus., t. vi, p. 297. 

 Zaphrentis cornicula Milne-Edwards and Haime, 18.51, Polypiers Foss. des 



Terr. Pal., p. 327, pi. vi, figs. la-e. 

 Cyathophyllum cornicula Rominger, 1876, Geol. Survey Mich., vol. iii, p. 102, 



pi. XXXV. 



Heliophyllum cornicuhim Grabau and Shinier, 1909, North Amer. Index 



Foss., vol. i, p. 68, fig. 104. 

 Heliophyllum corniculum Cleland, 1911, Wisconsin Geol. Survey, Bull, xxi, 



p. 29, pi. i, fig. 2. 



Description. — C'orallite simply conical, symmetrically curved; expand- 

 ing rapidly near apex. Exterior annulated by shallow constrictions 3 to 

 3 mm. apart, with finer transverse stria; between, and striated longi- 

 tudinally by septal furrows. Calyx large, 22 mm. wide, 12 mm. deep in 

 largest specimen observed, sides ascending for about J distance above base, 

 becoming erect near margin; bottom slightly elevated, smooth in center. 

 Septa about 80, primary septa about 40, ascending upon convex bottom 

 of calyx but not reaching its center, which is smooth; secondary septa 

 slightly narrower, not ascending upon elevated calyx bottom. Cardinal 

 septum in a distinct fossula which is situated upon convex side of corallum. 

 Septa carinate, their edges denticulate. Inner structure not observed. 



A large individual is 43 mm. long; diameter of calyx, 27 mm. 



A single good individual has been observed which differs slightly from 

 the typical form in the smooth calyx bottom and more erect sides. The 

 resemblance is, however, so close that it has not seemed wise to regard it as 

 a new species. The smaller individual figured is doubtfully referred to 

 this form. The stratigraphic position of this species is not assured. 



Occurrence. — Helderberg roKMATiox. Martin Mountain, Allegany 

 County. 



Co?Zec/ton.— Maryland Geological Survey. 



