INDlf\Nf\ Pf\Lf\&ONTOLOGY. 



deep depression in tiie bottom of the calyx, and extends to the anterior margin. 

 Situated in the fossette is one principal lamellte, and two rudimentary ones. 



The single elevated — lamellje in the bottom of the calyx — makes this easily 

 recognized from all other species. 



Found in the Upper Devonian (Hamilton group), near Charlestown, Indi- 

 ana. Now in the collection of the author. 



ZAPHRENTIS VARIANTS, N. Sp. 



Plate 2, Figs. 7 — 8. 



Corallum simple, turbinate, straight or regularly curved, attenuate below, 

 gradually or rapidly expanding in diameter to the calyx. Exterior with broad, 

 irregular annulations and wrinkles, caused by intermittent growth. Height 

 fifty millimeters. Calyx broadly bell-shaped, thirty millimeters in diameter. 

 Depth twenty millimeters. A flat space in the bottom of the calyx occupied by 

 the tabulae, fifteen millimeters in diameter. Number of lamella? seventy, in the 

 circumference of a cup twenty millimeters in diameter, alternating in length, 

 rounded and thickened at the margin, gradually sloping to the flat space in the 

 bottom of the calyx, here the short ones abruptly terminate. The longer ones 

 become sharp and slightly elevated, and continue a short distance on the tabu- 

 lae, and gradually disappear, leaving a flat, smooth space in the bottom of the 

 • calyx, from three to five millimeters in diameter ; in some other examples the long 

 lamelhe continues to the center of the calyx, twisted and slightly elevated. 

 Fossette consist of a deep depression in the bottom of the calyx, but disappears 

 before reaching the margin of the cup; position variable. 



Found in the Upper Devonian (Hamilton group), near Charlestown, Indi- 

 ana. Now in the collection of the author. 



ZAPHRENTIS ACUTICORNIS, N. Sp. 



Plate 2, Figs. 9—10. 



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

 of attachment, gradually, or sometimes rapidly expanding to the calyx; longi- 

 tudinal stria? fine, distinct. Exterior with broad, shallow annulations, caused 

 by intermittent growth. Height from twenty to thirty millimeters, varying 

 in different individuals. Diameter of calyx fifteen millimeters. Depth ten 

 millimeters. A flat space in the bottom of the calyx, occupied by the tabulgp, 

 six millimeters in diameter. Number of lamelUr fifty in the circumference of 

 a calyx, twelve millimeters in diameter, alternating in length, sub-equal at the 

 margin, abruptly sloping to the bottom of the calyx, where the short ones grad- 



