Upper Helderberg Group. 445 



120, of nearly uniform thickness, alternating in length, the larger ones 

 as they approach the bottom fasciculate, a few continue to the center, 

 coalescing with the tabulae. 



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



Cyathophyllum vesiculatum, n. sp. 



Corallum simple, elongate turbinate, attenuate below, curved, regu- 

 larly expanding to the calix, exterior with gentle undulations of growth; 

 height 35 mm.; diameter of calix 20 mm., depth 15 mm., sides regu- 

 larly sloping to the center; number of lamellae 60, slightly alternating 

 in size, very thin, the principal ones extending to the center of the 

 calix, not twisted. The interlamellar cysts are small, but very distinct, 

 giving to the corallum somewhat the appearance of a Cystiphyllum. 



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



Cyathophyllum bullatum, n. sp. 



Corallum simple, turbinate, attenuate below; calix broadly expanded ; 

 external striae very distinct, 12 in the space of 10 mm.; when 

 decorticated the striae are smooth, 6 in the space of 10 mm ; tabulae 

 broad, flat; height of corallum 60 mm. ; diameter of calix 35 mm., 

 having at the margin 8 lamellae in the space of 10 mm., alternating in 

 size, the principal ones becoming very thin and prominent below ; at 

 the bottom is a flat space 10 mm. in diameter, sometimes smooth and 

 sometimes with the lamellae faintly indicated; the interlamellar 

 cysts are elongate, very prominent, frequently entirely obscuring the 

 smaller lamellae. 



Formation and locality. Corniferous limestone, Canada West. 



Cyathophyllum coh^ere^s, n. sp. 



Corallum simple or compound, elongate turbinate ; exterior with 

 undulations of growth, striae fine, distinct ; height of corallum 

 45 mm.; calix shallow campanulate, with a diameter of from 15 

 to 20 mm., depth 6 mm.; number of lamellae 80, of nearly uniform 

 size at the margin, alternating below, the larger ones extending to the 

 center where they are twisted elevated and forming a false columella 

 of about 3 mm. in diameter ; on the inner surface of the calix are 

 numerous small cysts which sometimes obscure the lamellae. 



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



. Cyathophyllum septatum, n. sp. 

 Corallum simple, elongate turbinate or sub-cylindrical, exterior with 

 frequent constrictions, caused by intermittent growth, and numerous 

 concentric wrinkles; when decorticated the margins of the lamellae with 



