452 Thirty-fifth Keport on the State Museum. 



Heliophyllum fasciculatum, n. sp. 



Corallum simple, elongate turbinate; height 130 mm.; diam- 

 eter of the calix 50 mm. ; a space at the bottom of the calix from 10 

 to 15 mm. in diameter is concave-conical ; adjacent to this depressed 

 space is a flat area, the depressed and flat portions being 30 mm. in 

 diameter ; fossette small ; number of lamellae 110, alternating in size, 

 the smaller lamellae extend only to the flattened area, the larger la- 

 mellae extend to the margin of the concave conical space, and a few, very 

 much thickened, extend to the center ; 6 denticulations in the space of 

 5 mm. 



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



Heliophyllum ahnulatum, n. sp. 



Corallum simple, elongate, gradually expanding, usually compressed ; 

 exterior with prominent, rounded or subangular annulations of growth, 

 which are sometimes situated at quite regular distances apart; there are 

 also concentric wrinkles and fine striations ; longitudinal striae distinct ; 

 number of lamellae from 60 to 75; height of corallum from 100 mm. 

 to 150 mm. or more ; often extremely attenuate, and frequently flat- 

 tened from compression. In many examples the exterior does not 

 well preserve evidence of the generic relations of the fossil, but longi- 

 tudinal sections reveal, in a beautiful manner, the heliophylloid 

 structure. 



Formation and localities. Corniferous limestone, Scott and Clarke 

 counties, Indiana, and Youngs' farm, Erie county, New York. 



Heliophyllum compactum, n. sp. 



Corallum small, sub-cylindrical or elongate turbinate, straight or 

 slightly curved, gradually expanding ; exterior with broad undulations 

 of growth, also concentric wrinkles and fine striations ; height of cor- 

 allum 50 mm.; calix 20 mm. in diameter, depth 15 mm., sides 

 nearly vertical, abruptly expanding near the margin ; a space at the 

 bottom of the calix 8 mm. in diameter, flat ; number of lamellae 70, of 

 nearly uniform size at the margin of the calix, alternating on the sides ; 

 the principal lamellae extend on the flattened space at the bottom 

 abruptly coalescing with the tabulae, leaving a smooth area 5 

 mm. in diameter ; denticulations fine, 10 in the space of 5 mm.; no 

 fossette ; the tabulae are nearly flat at the middle, bending abruptly 

 downward near their outer margins. 



Formation and locality. Corniferous limestone, Palls of the Ohio. 



Heliophyllum dentatum, n. sp. 

 Corallum turbinate, straight or slightly curved ; exterior with 

 strong concentric wrinkles and striations ; height of corallum 50 mm.,. 



