412 



Keport of the State Geologist. 



PLATE LVIII. 



LEBEDICTYA, gen. nov. 



Page 361. 

 (See Plates LIX and LXI.) 



Lebedictya crinita, sp. nov. 



Page 361. 

 (See Plates LIX and LXI.) 



Figures 1, 2. Opposite sides of a specimen, probably representing most of 

 the sponge, retaining the aperture complete and showing its mar- 

 ginal fringe of long spicules. The cup has an essentially smooth, 

 gently expanding, slightly prismatic surface ; the face exposed in fig. 2 

 showing the finer net- work and the uneven growth of the reticulum 

 at the margin, while the surface represented in fig. 1 shows traces of 

 the erect outer spicular lamellae which form coarse quadrules, and at 

 the right, where exfoliated, a large internal bundle of vertical 

 spicules. 



Keokuk group. Crawfordsville, Indiana. 



