INDIANA PALEONTOLOGY. J68, 



FAVOSITES CLAUSUS, Rominger. 



Plate 49. Upper Figure. 



FaVosites Clausus, Rominger, Geological Survey of Michigan, page 37, plate xiv, upper 

 left hand figure, 1876. 



Rominger's description : Cluptered, rapidly branching and anastomosing 

 stems, varying from one-half to one centimeter in thickness. Tubes unequal, 

 larger ones circular, measuring in diflferent specimens from one-half to one and 

 a half millimeters in diameter; the smaller tubes filling the interstices between 

 the larger ones are subangular. Orifices at the ends of the branches all open, 

 on the sides of the stems most of them are found closed by opercula. Opercula 

 flat or convex, some of them decorated with twelve marginal carina radiating 

 towards the center. Diaphragms partly simple and regular, but largely inter- 

 mingled with irregular partial septa, formed by the development of lateral 

 squamae analagous to the vertical rows of leaflets in other species of Favosites. 

 Pores numerous. 



The specimen illustrated on Plate 49, upper figure, is from ihe Upper De- 

 vonian (Hamilton group) at Speed's cement quarry, Clark county, Ind., now 

 in my collection. 



LITHODRUMUS, N. Gen. 

 (Ety. lithos, a stone; dramos, a bush or thicket). 



Corallum compound. Tubes rounded-polygonal, unequal in size. Tab- 

 ulae flat and closely arranged, occupying more than half the diameter of the 

 corallite. Septa alternating in size and length, not strongly developed. Fos- 

 sette well defined in some cups; in some others only faintly indicated: and 

 occasionally a cup may have two fossettes. Interseptal urea vesicular. Type 

 Z. Veryi. 



LITHODRUMUS VERYI, N. Sp. 



Plat 49. Lower Figure. 



Corallum composite, rapidly increasing by lateral gemmation. Corallites 

 rounded-polygonal, unequal in size, surrounded by their own epithical wall, 

 intimately connected periodically by the expansion of the epithica, or they may 

 not connect only at the superior margin of the cup. Calyx broadly bell-shaped, 

 from ten to thirty millimeters in diameter, or slightly more in some cups. 

 Depth from five to fifteen millimeters. A flat space in the bottom of the calix 

 occupied by the tabulae, from five to fifteen millimeters in diameter. Tabulae 



