44:4 Thirty-fifth Beport on" the State Museum. 



Cyathophyllum impositum, n. sp. 



Corallum simple, turbinate, straight or slightly curved, gradually 

 expanding; exterior with frequent sharp constrictions, caused by 

 intermittent growth, giving to the corallum the appearance of being 

 composed of a series of invaginated calices ; external striae conspicu- 

 ous; height of corallum 80 mm.; diameter of the calix 40 mm., depth 30 

 mm.,sides quite regularly sloping to the center; a narrow fossette on both 

 anterior and posterior sides connected by a shallow depression; number 

 of lamellae from 100 to 110, alternating in size, somewhat thickened 

 near the margin, becoming very thin and sharp on the sides of the 

 calix; principal lamellae extending to the depression at the bottom of 

 the calix; on the sides of the lamellae, at right angles to the margin 

 are numerous rounded striae, sometimes projecting beyond the margins 

 and forming denticulations, but usually causing the margin to appear 

 obscurely crenulated ; the striae have the same direction as those 

 of Heliophyllum, but they are not distinct or continuous enough to 

 place the species under that genus. 



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



Cyathophyllum depressum, n. sp. 



Corallum simple, turbinate, straight or slightly curved, exterior with 

 annulations and undulations of growth and very prominent longitu- 

 dinal striae, of which there are 8 in the space of 10 mm. ; height of 

 corallum 80 mm., regularly expanding; diameter of calix 40 mm., 

 depth of anterior side 35 mm., sides parallel with the exterior 

 wall, a space at the bottom 20 mm. in diameter flat, with a deep 

 depression at the center; the fossette consists of a deep depression 

 sinistral to the center, its continuation on the side is obscurely indica- 

 ted; number of lamellae from 80 to 90, alternating in size, the smaller 

 ones very thin, extending to the flattened space at the bottom of the 

 calix,the larger ones fasciculating and extending to the center where they 

 are slightly twisted ; the interlamellar cysts are prominent, elongate, 

 sometimes obscuring the smaller lamellae. 



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



Cyathophyllum arctifossa, n. sp. 



Corallum simple, turbinate straight or curved, sometimes regularly 

 expanding from a conical apex, at other times the diameter at the 

 base is greater than at a short distance above; exterior with concentric 

 wrinkles and moderately prominent annulations; height of the corallum 

 80 mm.; calix broadly campanulate, having a diameter of 50 mm., and 

 a depth of 25 mm.; fossette,deep, narrow, commencing about 8 mm. from 

 the center and continuing to the anterior margin; number of lamelae 



