WHITE. | CARBONIFEROUS FOSSILS. 157 
Extreme length of an average-sized example, 17 millimeters ; long di- 
ameter of the calyx, 14 millimeters ; short diameter of the same, 123 mil- 
limeters. 
Position and locality.—This spevies is quite acommon one in the upper 
portion of the Burlington limestone division of the Subcarboniferous 
series at and in the vicinity of Burlington, Lowa. 
Genus LOPHOPHYLLUM Edwards & Haime. 
LOPHOPHYLLUM EXPANSUM White. 
Plate 39, figs. 4a and b. 
Lophophyllum expansum White, 1876, Proc. Acad. Nat. Sci. Philad., p. 27. 
Corallum broadly conical, slightly curved, transverse section subcir- 
cular; calyx broad, not deep; rays numerous; septal fossett not very 
distinct, situated at the convex side of the corallum; columella promi- 
nent but not large, laterally flattened so as to form a more or less sharp 
edge along its crest. Surface more or less rugose. 
Height of corallum and diameter of its calyx each about 20 millime- 
ters. 
This species is proportionally much broader than L. proliferum Mc- 
Chesney sp. of the Coal Measures, but not much more so than the typical 
forms of Lophophyllum. Ithas somewhat the aspect of certain forms of 
Azophyllum, but as its internal structure is not yet fully known, it is re- 
ferred to Lophophyllum because of its apparent external characters. 
Position and locality —Keokuk limestone division of the Subcarbonifer- 
ous series, Henry County, Iowa. 
Genus CHONOPHYLLUM Edwards & Haime. 
CHONOPHYLLUM SEDALIENSE (sp. NOV.). 
Plate 39, fig. 1 a. 
Corallam moderately large, approximately straight, the angle of 
divergence of its sides being quite small; calyx apparently rather shal- 
low; rays numerous; surface rough by the presence of numerous pro- 
jecting successive calyx-borders, and by coarse, irregular longitudinal 
strie. Only one example has been obtained, and that has been broken 
off at the lower end, and also somewhat crushed. Its full length was 
probably about 130 millimeters, and the diameter of the calyx about 30 
millimeters. 
Position and locality.—Near the top of the Chouteau limestone (Kin- 
derhook division of the Subcarboniferous series), Sedalia, Mo., where 
it was obtained by Prof. G. C. Broadhead. See remarks on this coral- 
horizon following description of Lithostiotion microstylum, on a subse- 
quent page. 
Genus MICHILINIA de Koninck. 
MICHILINIA ? PLACENTA (sp. DOV.). 
Plate 39, figs.1 a, b, c¢, and d. 
Corallum depressed or flattened, broadly convex above, flat or slightly 
concave below, free, or attached only in the young condition ; corallites 
moderately large, subequal in size, nearly regularly hexagonal; calyces 
