Upper Heldeebbrg Group. 457 



diameter of the calix 17 mm., depth 10 mm., broadly bell-shaped ; 

 fossette commencing near the center and extending to the margin ; 

 number of lamellae 50, alternating in size, the principal ones fascicu- 

 lating, coalescing and extending to the center. 



Formation and locality. Oorniferous limestone, Falls of the Ohio. 



Heliophyllum campanieorme, n. sp. 



Corallum simple, turbinate, robust, straight or curved; proportional 

 diameter of individuals of the same height variable; exterior with 

 concentric wrinkles and undulations ; no decided irregularities of sur- 

 face; external costae very distinct ; when decorticated the internal costae 

 appear as if composed of thin, imbricating laminae ; dimension's of an 

 adult specimen, height 70 mm., diameter of tne calix 60 mm., depth 

 35 mm., broadly bell-shaped ; number of lamellae 110, of nearly uni- 

 form size near the margin, alternating below ; the principal lamellae 

 fasciculating and extending to the center of the calix, where they are 

 somewhat twisted, but not elevated ; 5 or 6 denticulations in the space of 

 5 mm. Some of the individuals present a coarser aspect than others. 



Formation and locality. Oorniferous limestone, Falls of the Ohio. 



Heliophyllum eissuratum, n. sp. 



Oorallum simple, turbinate, regularly curved ; exterior compara- 

 tively smooth, longitudinal striae distinct, length of posterior side 15 

 mm., of anterior side 30 mm.; diameter of the calix 25 mm., depth 12 

 mm., sides parallel with the exterior of the corallum, a space at the 

 bottom 10 mm. in diameter essentially flat; fossette narrow, conspic- 

 uous, extending from the center to the anterior margin ; number of 

 lamellae 80, the larger ones extending sometimes to the center, at other 

 times leaving a flat or concave smooth space from 6 to 8 mm. in diam- 

 eter, denticulations fine; in one individual in place of the denticula- 

 tions there are notches in the lamellae; this feature may be due to the 

 breaking away of the denticulations ; tabulae at the center concave, 

 the outer portion bending abruptly downward, the intermediate 

 space elevated, The form of this species is very similar to Heliophyl- 

 lum (Zaphrentis) corniculum, but the denticulations are much more 

 minute and the bottom of the calix is quite different. 



Formation and locality. Oorniferous limestone, Falls of the Ohio. 



Heliophyllum cakcellatum, n. sp. 

 Corallum simple, broadly turbinate, acute at the base, regularly ex- 

 panding to the calix; length of posterior side 10 mm., of anterior 

 25 mm.; diameter of calix 20 mm., depth 10 mm., quite regularly con- 

 cave ; number of lamellae 110, the larger ones sometimes continuing 

 to the center, not elevated or twisted ; at other times there is a flat, 

 [Sen. Doc. No. 38.] 58 



