Foerste.] 
346 
[May 1, 
none having been discovered, although striations perpendicular to 
the wall were seen, of what structural value could not be deter- 
mined. Horizontal sections show a septal fovea on the apertural 
side, and that half the lamellae do not extend more than 2 mm., 
sometimes 3 mm. from the walls of the polyp. 
The much larger specimen from the cabinet of Mr. B. B. Thresher 
seems to be only an unusually large form of this species, the septa 
becoming more distant with age, so that near the top of the speci- 
men five ribs occur on the exterior in a width of 5 mm. A care- 
ful examination of these ribs, however, will show a faint median 
groove, showing that a small additional septum is here intercalated 
in each case. This form can readily be distinguished from Strep- 
telasma Hoskinsoni by its being more erect and having a more reg- 
ular outline and a greater angle of growth. From S. calycula it 
may be distinguished by its generally more erect form and per- 
fectly symmetrical development. The smaller typical specimens 
occur at the Soldier’s Home Quarry, near Dayton, Ohio, and at 
Todd’s Fork, near Wilmington, Ohio. 
The larger specimen just described was found at the Soldiers’ 
Home. 
Streptelasma obliquior, sp. nov. 
(PLATE IX, FIGS. 14, 15.) 
There is found, not infrequently, in the collection from Hanover, 
Ind., a small, simple, cup-shaped coral, of which it was impossible 
to determine accurately the genus, although the failure to find dis- 
sepiments in the calycular portion of the corallum makes it probable 
that it is some species of Streptelasma or Zaphrentis. The mouth of 
the catyx in all our forms is very oblique, the highest portion of the 
mouth being at the apertural gap, the lowest, on the opposite side. 
The corallum itself expands regularly and is convex on the aper- 
tural side and slightly concave in outline, on the opposite side. 
Most of the specimens show no external indications of septa, 
but in one much longer specimen there are external indications 
of the same in the customary longitudinal ribs, which are plain 
only along the upper half and chiefly on the apertural side. There 
are about thirty-five septa in the ordinary sized specimens 17 mm. 
long. 
