418 Thirty-fifth Keport on the State Museum. 



lum ; number of lamellae 60, alternating in size, the smaller ones fre- 

 quently indicated only by an intermediate row of nodes, several of the 

 larger ones extend entirely across the tabula at the bottom of the 

 calix ; denticulations strong, those of the smaller lamellae and on the 

 bottom of the calix appearing as rows of minute nodes. This species 

 will be easily recognized by its slender, frequently constricted form, 

 the vertical sides of the calix and the nodose lamellae extending across 

 the bottom. 



Formation and locality. Niagara group, Louisville, Kentucky. 



Heliophtllum mitellum, n. sp. 



Corallum simple, small, broadly turbinate, attenuate below, quite 

 regularly expanding to the calix ; height 10 mm., diameter of the calix 

 15 mm., depth 5 mm., quite regularly sloping to the center ; at the bot- 

 tom a small flat or concave, smooth space ; fossette very obscure or ob- 

 solete ; exterior with numerous concentric wrinkles, occasionally with 

 sharp constrictions ; external striae very distinct ; number of lam- 

 ellae 60, alternating in size, the smaller ones being about one-half the 

 thickness of the others, which continue nearly to the center of the 

 calix ; denticulations narrow, prominent, appearing as slender spinules, 

 14 in -the space of 5 mm.; on the sides of the lamellae the striae are 

 rounded. 



Formation and locality. "Niagara group, Louisville, Kentucky. 



Heliophtllum puteatum, n. sp. 



Corallum simple, small, turbinate, curved ; exterior with sharp, thin 

 annulations and numerous concentric striae ; acute at the base, quite 

 regularly expanding to the calix ; height 12 mm., diameter of the calix 

 10 mm., depth 5 mm., at the center is a depression of 3 mm. in depth 

 and 3 mm. in diameter at the top, gradually growing narrower; num- 

 ber of lamellae 70, alternating in size, the smaller ones a little less 

 than one-half the thickness of the others, sometimes appearing only as 

 a row of small nodes; the principal lamellae extend to the center ; den- 

 ticulations prominent, 15 in the space of 5 mm. 



Formation and locality. Niagara group, Louisville, Kentucky. 



CYSTIPHYLLUM, Lonsdale. 



Cystiphyllum granilineatum, n. sp. 



Corallum simple, turbinate, straight or slightly curved, acute at the 

 base, regularly and quite rapidly expanding to the calix, exterior with 

 concentric wrinkles and numerous fine but distinct concentric striae, 



