440 Thirty-fifth Kepoet on the State Museum. 



space of 10 mm.; height of corallum 40 mm., diameter of the calix 60 

 mm., depth 10 mm., 'sides nearly vertical, bottom flat, 15 mm. 

 in diameter ; fossette narrow, not extending to the margin, position 

 variable ; number of lamellae from 60 to 70, alternating in size, more 

 nearly uniform at the margin than below. The smaller lamellae are 5 

 mm. in length, the others from that point are much more conspicuous 

 than above, usually extending to within 5 mm. of the center, leaving 

 a flat, smooth space of 10 mm. in diameter, but sometimes extending 

 on the tabulae, coalescing with it, and occasionally a few continuing to 

 the center. 



Formation and locality. Oorniferous limestone, Crab Orchard, 

 Kentucky. 



ZA.PHRENTIS GRAVIS, n. Sp. 



Corallum simple, turbinate, regularly curved or tortuous, gradually 

 expanding ; exterior with numerous sharp annulations and constric- 

 tions, caused by intermittent growth; external striae very distinct, 

 from 8 to 10 in the space of 10 mm., when decorticated presenting an 

 invaginated, somewhat cystose appearance; height of corallum 70 

 mm., diameter of the calix 40 mm. Of the numerous individuals ob- 

 served the sides of the calix are broken so that its true form cannot be 

 ascertained ; number of lamellae from 60 to 70, alternating in size, the 

 larger ones usually extending to within 5 mm. of the center, leaving a 

 flat, smooth space of 10 mm. in diameter ; occasionally a few extend 

 to the center but are not prominent; tabulae broad. This species most 

 closely resembles Z. curvata, but is much more solid, and the lamellae, 

 as they approach the flat space at the bottom of the calix, are not so 

 prominent. 



Formation and locality. Oorniferous limestone, Crab Orchard, 

 Kentucky. 



Zaphrentis transversa, n. sp. 

 Corallum simple, turbinate, curved, attached portion broad, not reg- 

 ularly expanding to the calix ; decorticated specimens have numerous 

 sharp annulations caused by intermittent growth, but not presenting 

 an invaginated appearance; height of corallum 50 mm., diameter at 

 the base 15 mm.; calix somewhat campanulate, diameter 30 mm., 

 depth 15 mm. There are two narrow fossettes situated opposite each 

 other (one more conspicuous than the other), commencing near the 

 center and continuing to the margins; number of lamellae from 75 to 

 90, alternating in size, about 5 of the principal lamellae extend across 

 the bottom of the calix, connecting with those of the opposite side, 

 •generally at right angles to the fossette, though sometimes oblique ; 

 the lamellae situated between these coalesce with them a short distance 

 from the center, the remaining larger lamellae converge toward the 



