LIOSTEPHANIA. 



5I 



LIOSTEPHANIA EHR, 1847. 



Valves hyaline, angular, or circular, without 

 costae or straight rays, not enlarged near the 

 margin, or near the centre, and not touching 

 the margin. 



In the text will be found (fig. 244) a drawing 

 of Liostephania magnified Ehr., found in the 

 Barbadoes deposit. 



Fig. 244, Liostephania 



magnified. We are far from a full knowledge of the genus 



Liostephania, and I am much disposed to believe that they are internal valves 

 of forms not yet determined, probably of an Asterolampra. 



GYROPTYCHUS AD. SCHM., 1890. 



Fig. 245.- Gyroptychus contabulatus. 



Disc radiating, punctate, cellular, or granular, with centre 

 granular, not stellate, marginal portion divided into numerous 

 compartments by costae, enlarged in the form of spokes of a wheel. 



Gvroptychus contabulatus (fig. 245) is Dr. Adam Schmidt's figure. I 

 think this also is an internal valve, probably of an Actinopiychus. 



