74 



Found by R. A. Blair, in whose honor the specific name is pro- 

 posed, in the Chouteau limestone, at Sedalia, Missouri, and now 

 in the collection of S. A. Miller. 



CONULARIA GRATIOSA, n. Sp. 



Plate VIII, Fig. 1, showing two sides of a slightly compressed 



specimen. 



Shell very large, rather rapidly expanding, from the apex, 

 pyramidal and having subequal, lateral surfaces, which are 

 slightly convex. Angles at the four corners moderately fur- 

 rowed. Lateral surfaces marked with a longitudinal, mesial 

 line, without any furrow. Surface ornamented with transverse, 

 wide, smooth furrows, that are separated by sharp, prominent, 

 crenate, transverse costse; in passing across the sides, these 

 curve forward toward the aperture, and sometimes the costse 

 alternate in the middle, and, at other times, cross the mesial 

 line almost without interruption. There are from ten to thir- 

 teen costae in a distance equal to the width of a side. The 

 cost® are abruptly curved toward the aperture, in the furrows, 

 at the four corners. 



Our specimen is somewhat compressed, the four sides are 

 quite well preserved and seem to be nearly complete at the 

 larger end; it has a length of five inches, though one or two 

 inches are broken away from the apical end. 



This is a large and beautiful species, and will be distinguished 

 by the convex sides, distant, crenulated, transverse costse and 

 wide, smooth furrows. 



Found in the St. Louis Group, at Spergen Hill, Indiana, and 

 now in the collection of Wm. F. E. Gurley. 



CONULARIA SPERGENENSIS, n. sp. 



Plate VIII, Fig. 2, view of a specimen, with both ends destroyed. 



Shell very large, long, slowly expanding, at least, toward the 

 larger end; subcorneal, and having, so far as can be observed, 

 equal lateral surfaces. Angles at the four corners indicated by 

 a slight, poorly defined furrow. Lateral surfaces marked with 

 a longitudinal, mesial line, without any furrow. Surface orna- 

 mented with numerous, very small, closely crowded, transverse 

 striee of very nearly the same size, on all parts of the shell. 



