PLATE 37. 

 Lovenechinus nobilis (Meek and Worthen). Page 335. 



Fig. 1 . Burlington Group, Lower Carboniferous, Webb City, Missouri. Mus. Comp. Zoo!. Coll., 3,124 (from R. T. J. Coll.). 

 Natural size. Five columns of thick, massive plates in each interambulacral area. The thickness of the plates is 

 seen well in the lower part of the figure, where also is seen a mold of the internal faces of some plates that are absent. 

 Drawings, Plate 38, figs. 8, 9. 



Fig. 2. Same horizon and locality. Mus. Comp. Zool. Coll., 3,123 (from R. T. J. Coll.). Natural size. Fragment of a 

 massive specimen, with one interambulacrum complete at the mid-zone and a more complete ambulacrum. Draw- 

 ings, Plate 38, figs. 4, 5. 



Fig. 3. Burlington Group, Lower Carboniferous, Calhoun County, Illinois. U. S. Nat. Mus. Coll., 33,277. Natural size. 

 This magnificent specimen shows ambulacral detail clearly in area B, and five columns of plates in each interambula- 

 crum. Drawings. Plate 38, figs. 6, 7. 



