Elem — Revision of the Palaeozoic Palae'echinoidea. 43 



1894. Melonites multipora. Keyes, Mo. Geol. Surv., vol.4, 

 p. 125, pi. 16, tigs. 1 a, b; pi. 17, figs. 1 a-c. 



1894. Melonites indianensis . Miller and Gurley, Bull. No. 

 3, 111. State Mus. Nat. Hist., p. 5, pi. 1, fig. 1. 



1894. Oligoporiis sulcatus. Miller and Gurley, Bull. No. 3, 

 111. State Mus. Nat. Hist., p. 8, pi. 1, figs. 4, 5. 



1895. Melonites multipora. Keyes, Proc. Iowa Acad. Sci., 

 vol. 2, p. 181, pi. 19, figs, la, b; pi. 20, figs. 1 a-c. 



1896. Melonites multiporus. Jackson and Jaggar, Bull. 

 Geol. Soc. Amer., vol. 7, p. 135, pi. 2, figs. 1-7; pi. 

 3, figs. 30-17; pi. 4, fig. 18; pi. 5, fig. 20. 



1896. Melonites giganteus. Jackson, Bull. Geol. Soc. Amer., 

 vol. 7, p. 172, pi. 4, fig. 19; pi. 5, figs. 21-24. 



Test large and spherical. Interambulacrum composed of 

 from seven to ten or even more columns of plates. Ambu- 

 lacrum about two-thirds as wide as the interambulacrum, 

 composed of very irregular plates. Surface covered with 

 numerous small granules, about thirty to each interambulacral 

 plate. 



Remarks. After examining a number of specimens as 

 large as that figured by Mr. Jackson as Melonites giganteus, 

 and comparing them with specimens of Melonites rmdtiporus , 

 I feel that Melonites giganteus should be considered an accel- 

 erated development of Melonites multiporus, and therefore 

 synonymous with it. Its claim to validity rests on its large 

 size and upon the fact that there are ten or eleven columns in 

 each interambulacral area. In a collection of several hundred 

 specimens of Melonites multiporus one can find any number 

 with ten, eleven and even twelve columns in one or more in- 

 terambulacral areas, but which agree in every other essential 

 feature with Melonites 7nultiporus. 



Geological formation and locality : St. Louis Limestone, 

 St. Louis, Mo. ; Clarksville and Charlotte, Tenn. ; Greenville, 

 Harrison Co., Indiana; Bowling Green, Ky. 



5. Melonites septenarius Jackson. 



1896. Melonites septenarius. Jackson, Bull. Geol. Soc. 

 Amer., vol. 7, p. 182, pi. 9, fig. 49. 



