158 GEOLOGICAL SURVEY OF THE TERRITORIES. 
shallow, the bottom of each being slightly convex; the whole surface of 
the calyx coarsely granulate; rays numerous but slightly developed, 
consisting only of granular raised radiating strie, apparently existing 
only upon the sides of the shallow calyx and not upon its rather broad 
bottom; transverse plates or tabule few, and all of them appear to have 
extended all the way across the corallite. Under surface of the coral- 
lum covered with a distinct epitheca, and marked by strong concentric 
wrinkles. The largest example collected contains about forty corallites, 
and the smallest nineteen. Diameter of the larger calyces of the former 
about 12 millimeters; of the latter about 9 millimeters. . 
This species is known only by silicified examples, which do not show 
very clearly the details of internal structure, and it is probable that it 
does not strictly belong to the genus Michilinia; but lam not acquainted 
with any published genus to which it can be more satisfactorily referred. 
The tabule are few, and they seem to extend all the way across the 
corallites in all cases, without a tendency to form vescicles in the central 
space, as is common inthe genus Michilinia. The communicating pores 
are numerous, as indicated by the silicious casts of the spaces between 
the tabule. It is probably congeneric with the Favosites divergens of 
White & Whitfield, and it seems also to be congeneric with the next de- 
scribed species, all three of which belong to the same geological horizon. 
Remarks upon this interesting coral horizon are made in connection 
with the description of Lithostrotion microstylum, on a following page. 
Position and locality—Top of the Chouteau limestone (Kinderhook 
division of the Subcarboniferous series) at Sedalia, Mo. where it was 
obtained by Prof. G. C. Broadhead. 
MICHILINIA EXPANSA (Sp- NOV.). 
Plate 39, figs. 2 a and b. 
Corallum forming broadly expanded masses, which are less symmetrical 
than those of the last described species; upper surface irregular, but 
flattened; under surface unknown; corallites moderately large, more or 
less irregular in shape in consequence of some inequality in size; calyces 
averaging 8 or 9 millimeters in diameter, moderately deep; rays numer- 
ous, but not prominent; walls well developed; tabule having the usual 
character of those of this genus. 
This species, like the last described, is known only by silicified speci- 
mens, all of which are more imperfect than those of the last described 
form. The walls appear to be unusually thick for a Michilinia, but this 
is probably due to their silicified condition. This condition has also 
obscured the radiate markings of the calyces, and also rendered the 
tabulz somewhat obscure. It differs from the last described species, 
with which it is associated, in the greater irregularity of the corallum 
and of the corallites, in the greater depth of the calyces and the less 
granular character of the calycular surfaces. The largest example dis- 
covered measures more than a hundred millimeters across the top of the 
corallum. 
Position and locality—Top of the Chouteau limestone (Kinderhook 
division of the Subcarboniferous series), Sedalia, Mo., where it was 
obtained by Professor Broadhead, and where it is associated with several 
other coral species. See remarks following description of the next 
species. . 
