426 Thirty-fifth Report on the State Museum. 



PTYCHOPHYLLUM, Edwards and Haime. 



Ptychophyllum versiforme, n. sp. 



Corallum simple, turbinate, curved, sometimes tortuous, quite 

 rapidly expanding ; length usually from 40 to 60 mm.; diameter of 

 calix Irom 40 to 70 mm.; exterior with freqaent sharp annulations 

 and concentric striae ; the calix for some distance from the ^margin is 

 flat and then abruptly descending, having a depth of from 15 to 20 mm.; 

 center of calix elevated ; number of lamellae from 90 to 100, slightly 

 alternating in size, near the margin broad and nearly flat, becoming 

 sharper as they approach the center ; the stronger lamellae continuing 

 to the center, are twisted and elevated, forming a false columella. 



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



Ptychophyllum striatum, n. sp. 



Corallum simple, broadly turbinate ; height 35 mm.; diameter of 

 calix 40 mm., depth 15 mm., broadly bell-shaped, an area at 

 the bottom 15 mm. in diameter, nearly flat; number of lamellae 74 of 

 nearly uniform size at the margin, alternating below; the sides of the 

 lamellae have very prominent, interrupted, sharp striae ; the principal 

 lamellae continue to the center where for a space 10 mm. in diameter 

 they are twisted and turned laterally, the striations of the lamellae 

 forming the most conspicuous feature. 



Formation and locality. Oorniferous limestone, Western ISTew York. 



AULACOPHYLLUM, Edwards and Haime. 



AULACOPHYLLUM CONVERGERS, 4b. Sp. 



Corallum simple, broadly subxurbinate, irregularly curved ; exterior 

 comparatively smooth, with concentric wrinkles and striations ; longi- 

 tudinal striae, fine, distinct ; individuals of the same height have a 

 diameter at the calix varying from 25 to 45 mm.; height of one indi- 

 vidual 10 mm., length of posterior side 12 mm., of anterior side 25 

 mm.; diameter of the calix 20 mm., for a space of 5 mm. from the 

 margin flat, then the posterior portion nearly vertical, the anterior 

 portion concave ; fossette narrow, deep, extending from the bottom 

 of the calix to the anterior margin ; number of lamellae varying from 

 80 to 120, according to the diameter of the calix, alternating in size, 

 thin, denticulated ; convergence of lamellae to the fossette very distinct. 



Formation and localities. Oorniferous limestone, Falls of the Ohio 

 and Clark Co., Ind. 



