IOWA ACADEMY OP SCIENCES. 
181 
Melonites multipora Norwood & Owen. 
Melonites multipora Norwood & Owen, 1846; Am. Jonr. Sci., (2), 
vol. II, p. 222, figs. 1-2. 
Melonites multijyora Roemer, 1855; Arch, fur Naturgeschichte, 21 
Jahrgang, I Band, pp. 312-320, xii Taf. 
Melonites multipora Meek & Worthen, 1866; Geol. Sur. Illinois, 
vol. II, p. 228. 
Melonites multipora Safford, 1869; Geology Tennessee, p. 346. 
Melonites stewartii Safford, 1869; Geology Tennessee, p. 346, jDlate 
vi, figs, la-cl. 
Melonites irregularis Hambach, 1884; Trans. St. Louis Acad. Sci., 
vol. Ill, p. 549, pi. C, fig. 2. 
Melonites multipora Keyes, 1894; Missouri Geol. Sur., vol. IV, 
pi. xvi, figs. la-l). 
Test large, spherical, with ten meridional folds, of which the 
ambulacral are the narrower. Ambulacral areas about two- 
thirds the width of the interambulacra, each composed of about 
ten rather poorly defined rows of very irregular pore-plates, the 
ossicles of the central two ranges being about three times as 
large as the others. The interambulacral areas have eight 
rows of hexagonal ossicles, the marginal ones being only about 
one-half the width of the others; toward the poles, however, the 
jDlates are somewhat irregular and the ranges are not distinctly 
defined. The apical disk is rather small in size; the oculars are 
very small, only about one-fifth the size of the genitals, quad- 
rangular in outline, and so far as is known, not perforated. The 
genitals are quite large, sub-pentagonal in shape, <one being 
slightly larger than the other four. The madreporic plate is 
perforated by numerous very minute openings, and apparently 
by a single large one. The two genitals nearest the madre- 
porite have each four large perforations and the two opposite 
each three. The number of holes in the genital plates appears 
to differ somewhat in different specimens. The oral aperture 
is rather small, subcircular in outline. Five strong triangular 
jaws have been observed within the peristome of some speci- 
mens. The surface of the test is covered by numerous small 
granules, which support the spines, about thirty occupying each 
interambulacral plate. 
Horizon and localities. Lower Carboniferous, St. Louis lime- 
stone: St. Louis, Missouri; Clarkesville and Charlotte, Ten- 
nessee. 
