INVERTEBRATES. 75 



Position ami locality: Wnrsnw division of the St. Louis 

 limestone, Coalsburg, Ky. 

 Collector, E. O. Ulrich. 

 No. 2558 of the Illinois State Museum. 



ZAPHRENTIS CAKINATUS (sp. nov.) 



PL X, Figs. 3-3a. 



Corallum curved, strongly compressed laterally; calyx deep, 

 ovate; septal fossette extended on the side of least curvature. 

 Primary lamella? about thirty, with about the same number of 

 very short secondary lamellae intercalated between the primaries. 



Length 1% inches; breadth of calice on its widest diameter % 

 inch; opposite diameter of the same % inch; depth of calice % 

 inch. 



Position and locality : The specimen figured was obtained at 

 Beutousport, Iowa, and probably belongs to the Keokuk or 

 St. Louis limestone, both of which outcrop in the vicinity. 



Collector. A. H. AYorthen. 



Xo. 2564 of the Illinois State Museum. 



ZAPHRENTIS CLIFFORDANA. Edw. and Haime. 



PI. X, Figs. l.la. Ib. 



Corallum in the form of a curved cone, external ridges not 

 prominent, epitheca thin, making visible the ribs series of which 

 ;)? 'qual, plane and rather elosp. (Yilicc circular and rather 

 dcpp; fossette rather large and situated on the side of least 

 curvature: lamella? thirty-two to thirty-six, sub-equal, strong, 

 a little thickened outwardly and thinning towards the interior, 

 reaching generally to the center of the upper floor on which 

 tlipy are a little curved, and not elevated. Their free border 

 appears to be cut obliquely. One distinguishing feature of the 

 species is the equal number of rudimentary and primary 

 Lamellae." 



The above description applies very well to a common form of 

 Zaphrentis in the Kinderhook beds of Illinois, and the speci- 

 mens figured are from that horizon in Monroe county. 



Collector A. H. Worthen. 



Xo. 2570 of the Illinois State Museum. 



