Silurian Fossils 
103 
ridges corresponding to the spaces between the septa, crossed by 
fine transverse striae and constrictions of moderate depth. 
Brownsport bed: near home of E. Duncan, one and one-half 
miles east of Linden; also at the glade southeast of Brownsport 
Furnace, three miles west of Vice landing, and 8 miles east of 
Savannah on the Waynesboro road; all in Tennessee. 
Alveolites inornatus, sp. nov. 
{Plate III, Fig. 56 .) 
Corallum massive, increasing in thickness by the addition of 
successive layers which are adnate to one another, the later layers 
often projecting slightly beyond those of earlier origin so as to form 
an irregularly convex lower side, covered by a very thin epitheca 
concentrically wrinkled. The upper surface usually compara- 
tively flat. Maximum thickness of one specimen, 32 mm.; width, 
80 mm. Four to five apertures in a width of 5 mm;, upper wall of 
the aperture distinctly convex, its sides resting upon the median 
parts of the upper walls of the subjacent apertures; lower wall 
• formed by the adjacent parts of the upper walls of the subjacent 
apertures. No trace of a cycle of denticules at the aperture, nor 
of longitudinal rows of spinules along the inner surface of the walls 
forming the aperture; no large marginal pores have been detected. 
Usually the inner walls of the aperture appear smooth but occa- 
sionally there is a longitudinal striation along the median part of 
the lower wall, and rarely a similar striation along the median 
part of the upper wall. Anterior outline of upper wall nearly 
straight or more or less concave. Degree of vertical compression 
j of the aperture variable, the apertures being sometimes compara- 
I tively high as in the more typical forms of Alveolites, at other times 
' compressed and transversely slit-like. This form was at first iden- 
tified with Alveolites niagarensis^hul the characteristic features of 
that species cannot be detected. 
I Brownsport bed : near the home of E. Duncan, one and one-half 
' miles east of Linden, at the mouth of Jacks Branch of Short creek, 
! Tennessee. 
I Pachypora (Platyaxum) pegramensis, sp. nov. 
{Plate III, Fig. 570 
Corallum forming flat, thin fronds, i to 3 mm. thick, irregularly 
lobate, with corallites on both sides. Corallites appearing as nar- 
