82 PALEONTOLOGY OP^ ILLINOIS. 



(JKxrs AMPLKXUS. Sowci-hy. 

 AMPLEXIS GKXICULATUS. (sp. nov.) 



PI. X, Fig?.. 7-7a. 



Coral cylindrical above the geniculate portion and pointed 

 below, and abruptly bent about half an inch above the lower 

 extremity so as to form nearly a right angle with the upper 

 part of the coral. Cup comparatively deep; lamellae twenty -four 

 or more; septal fossette not distinct on the specimens in lunid ; 

 septa rather thicker than the intervening spaces. 



Surface marked by a few undulating transverse ridges, and 

 numerous longitudinal striae. 



Its geniculate character alone will serve to readily distinguish 

 this species from any other known in the carboniferous rocks. 



Position and locality: Chester limestone, Pope county, 111. 



Collector, A. H. Worthen. 



No. 256G of the Illinois State Museum. 



