+ TENTH ANNUAL REPORT. 
Or 
Length to in., about two inches are of slender and tortuous 
beginning and are broken off. Its diameter is nearly 3 in. 
and retains it from 6 in. upward. Calyx of the same dia- 
meter, one inch and } deep; lamellz 180, the larger ones 
occupying 1-3 of the calyx and retain, although very short 
at the margin, a sharp ridge, while the floor is raised 
in the center into an elongate ridge-like mamae. No fos- 
sette is observable. — Corniferous Limestone, Ohio Falls. 
Thecia Kentuckyensis, sp. nov. 
(Plate IX. Fig: 14. Slightly ‘reduced.) 
Corallum massive, compound, somewhat pyriform, as 
large as a good handpiece, without epitheca. Orifices 9 to 
$in., much larger than in any other species seen; walls stout, 
pentagonal ; tubes marked on each side by three deep striz, 
causing dentated margin like minute tents, being joined in 
this form from the next door orifice; mural pores large, 
not numerous. The specimen is silicified and has to some 
extent preserved its original structure. Spinal projections 
from walls somewhat flattened and short and quite numer- 
ous, filling the spaces of distinct diaphragms. — Hamilton 
Group, Crab Orchard, Ky. 
Thecia Schriveri, sp. nov. 
(Plate X% Fie rs5. Slichtly reduced!) 
Corallum ramose, preserved piece one inch and a half 
in length and 5 in. thick. Orrifices large g to one inch; walls 
stout, sides of tubes fluted by three striz, causing the den- 
tated structures or orifices. Mural pores large and sparingly. 
Specimen poorly preserved by silicification, but still present- 
ing its characteristic order. — Medina Sandstone, Cumber- 
land, Md. 
Favosites cystoides, sp. nov. 
(Plate Xs" Figs s16) slightly, rediteed)) 
Tubes in diameter 5 to 4 inch, equal sized, sharply 
polygonal, thin walled; diaphragms flat and at irregular dis- 
