302 
Aug. F. F 0 er St e 
county, it would seem that this form represented a distinct species. J 
The differences are probably due to changed physical conditions, -j 
The Middle Hudson strata of Linney are the stratigraphicax i 
equivalent of the Garrard sandstone of Campbell. The mudstone j 
is an argillaceous limestone. The stratigraphical position of r 
Linney’s specimen and that here described as Brachiospo 77 gta 
Icevis undoubtedly is the same. There is very little doubt as to I > 
the specific equivalency of the two specimens. From this it i 
follows that Brachiospongia Icbvis has a suborbicular osculum, 
campanulate below. The number of arms probably varies as in 
Brachiospongia digitata. The absence of geniculation probably 
is a specific characteristic. The arms of the specimen from 
Madison county are much longer, but this may be due to better 
preservation. 
Dystactospongia madisonensis, sp. nov. 
{Plate IX, Figs, i, 5 .) 
Sponge massive, irregularly lobate; the lobes in one specimen 
attain a length of lo© or more millimeters, with a diameter of | ' 
about 40 millimeters. The surface of these lobes may be com- ' 
paratively even or slight!)/ nodose. Sometimes one of the lobes 
is traversed vertically by a broad groove, probably a case of incipient 
lobation. In the central parts of the sponge, the fibers appear to 
anastomose so as to produce an irregular net-work, but toward 
the surface a series of vertical passages results. These passages 
vary from 4 to 7 millimeters in length, are perpendicular to the 
surface, are about half a millimeter in diameter, and are separated 
by coenenchym having about the same thickness. The openings 
at the surface are irregular, the larger ones frequently attaining a 
width of one millimeter, between which the smaller openings are 
interspersed. In the specimen from the vicinity of Versailles, 
oscula between 1.5 and 2 millimeters in diameter, and from 7 to 14 
millimeters apart, are present. In other specimens, oscula were not 
noticed. In the specimen from Madison, this coarser sponge 
structure appears to be covered by a thin film without apertures 
but with numerous irregular elevations as in some specimens 
referred to Lahechta. For the present this is regarded as a para- 
sitic stromatoporoid growth. 
Geological position. Lower part of the Saluda bed. Along 
