7C PALAEONTOLOGY OF ILLINOIS. 



/AI'HRENTIS ULUICHI, (sp. HOV.) 

 PI. X, Figs. 10-10a. 



Corallum small, pointed, compressed and slightly curved; cup 

 ovate, shallow; septal fossette comparatively wide, extending 

 from the center to the margin of the cup on the side of least 

 curvature. 



Lamellae fifty-two to fifty-four on the outer margin, but coal- 

 escing in pairs about one-third the distance from the margin to 

 the center of the cup, so that only about twenty-six reach the 

 central fossette. 



Length of a medium size individual % inch ; width of the cup 

 across the greatest diameter % inch; in the opposite direction 

 % 6 inch. 



This species is closely related to Z. cakariformis, Hall, from 

 the same horizon, (erroneously assigned by the author of the 

 species to the Corniferous limestone,) but differs from that in 

 its compressed, and more rapidly expanding form. 



Position and locality: Warsaw division of the St. Louis lime- 

 stone, Coalsburg, Ky. 



Collector, E. O. Ulrich. 



No. 2573 of the Illinois State Museum. 



ZAPHRENTIS LANCEOLATUS. (sp. nov.) 



PL X, Figs. 4-la. 



Corrallum small, pointed at the lower extremity, com pressed, 

 lanceolate, widening regularly from the pointed extremity to the 

 upper margin of the cup; septal fossette well developed, and 

 ranged in direction with the greatest diameter of the cup. 

 Lamellae twenty-two to twenty-four, all reaching to the border 

 of the septal fossette. 



Length of an average size specimen 13 /i i n ch; breadth across 

 the greatest diameter of the cup, % inch; the broadest speci- 

 men seen measured in length 10 /i G inch; breadth of cup across 

 its greatest diameter, / 16 inch; in the opposite direction, / ln 

 inch. 



Position and locality: Warsaw beds of the St. Louis group, 

 Spergen Hill, Indiana, and Coalsburg, Ky. 



Collector, E. O. Ulrich. 



No. 2572 of the Illinois State Museum. 



