446 Thirty-fifth Report on" the State Museum. 



the intermediate structure are usually shown ; height of corallum 60 

 mm., diameter of the calix 20 mm., number of lamellae 60, of nearly uni- 

 form thickness, alternating in length, the principal ones extending to 

 within a short distance of the center, leaving a smooth flat space 4 

 mm. in diameter. 



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



Cyathophyllum perfossulatum, n. sp. 



Corallum simple, broadly turbinate, robust, sometimes contracted 

 above, exterior with numerous concentric wrinkles and striations, with 

 constrictions caused by intermittent growth ; diameter of the calix 

 50 mm., depth 25 mm., quite regularly concave ; fossette deep, broad, 

 extending from near the center to the margin; number of lamellae 75 

 alternating in size, the smaller ones extending only a short distance 

 from the margin, the others are very thin, all extending to within a 

 short distance of and a few quite to the center, coalescing and forming 

 a narrow elongate crest; margins of lamellae denticulate, no striae on 

 the sides ; interlamellar space strongly vesiculosa 



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



Cyathophyllum cokcektricum, n. sp. 



Corallum simple, turbinate, regularly curved, solid, exterior with 

 undulations of growth and numerous fine concentric rugose striae ; 

 longitudinal striae distinct; height of corallum 50 mm.; diameter of 

 the calix 30 mm., depth 20 mm., sides quite regularly concave, a space 

 at the bottom 10 mm. in diameter flat ; fossette extending from near 

 the center to the anterior margin ; number of lamellae 100, of nearly 

 uniform size at the margin of the calix, alternating below ; in some 

 specimens the principal lamellae extend to the margin of the flattened 

 area, ending abruptly, leaving the central portion smooth, in others 

 they extend to the center, though abruptly becoming much 

 smaller at the margin of the flat space; when decorticated the internal 

 striae are crenulated or united by septa. 



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



Cyathophyllum scalekum, n. sp. 

 Corallum simple, turbinate, compressed, acute at the base, regularly 

 expanding to the calix, exterior with undulations and constrictions 

 caused by intermittent growth; striae distinct, 9 or 10 in the 

 space of 5 mm.; calix very oblique; length of posterior side of 

 corallum 25 mm. of anterior 75 mm.; diameter of calix 50 mm., depth 

 20 mm., quite regularly concave ; fossette conspicuous, commencing 

 at the center and continuing to the anterior margin; number of lam- 

 ellae 110, alternating in size; within a short distance of the center the 



