295 
dividing every 10 mm. into subeylindrical solid branches, 4 to 6 mm. in 
diameter. Maculae of clusters of large zoecia are rather numerous, 6 in 
one-fourth of 1 sq. mm. 
Zoecia are subangular, 8 to 8% in 2 mm., contiguous on the sides only and 
separated at most angles by intercellular spaces (mesopores) of irregular 
shapes and sizes, in surficial sections of mature specimens. In tangential 
sections of the submature region or of young specimens the zoecia are 
angular and thin-walled; mesopores are few. 
Acanthopores are distinct, located at the junction angles and between 
contact zoecia, occasionally inflecting the walls; 4 to 5 among 10 zoecia. 
In the longitudinal section the zoecia of the axial region are thin-walled, 
crossed by diaphragms, few in number, and arranged in zones, convex up- 
ward, which probably bears a relation to periods of less rapid growth. The 
zoecial tubes turn outward in a slight curye to the initial portion of the 
thin mature region where the bending is short, angular and sufficient to per- 
mit the zoecia to approach the surface perpendicularly. The walls of the 
zoecia on the mature zone thicken slightly and are separated by a distinct 
median dark line. <A single diaphragm (absent in some zoecia) is present 
near the turn of the zoecia from the submature to the mature zone. 
Occurrence: Pierce limestone, Murfreesboro, Tennessee. 
Holotype: 44707 U. S. Nat. Mus. 
Batostoma conferta n. sp. Plate X, Figs. 1-3. Zoarium consists of ramose 
subeylindrical solid stems 5 to 6 mm. in diameter. Maculae and monticules 
are absent. Acanthopores are large, sharply defined and irregularly dis- 
tributed about the zoecia. Four to eight usually surround a single zoecium 
and inflect one or all of the walls of contiguous tubes. 
In the tangential section the zoecia are thick-walled, polygonal, six to 
six and one-half in 2 mm., with an occasional mesopore. There is a distinct 
median dark line separating the walls. In the axial region the zoacial tubes 
are thin-walled. Diaphragms are rare or absent in immature region, but 
numerous in the late submature region and in the mature zone; 3 to 5 
occur in the space of one tube diameter. Incomplete and coalesced dia- 
phragms are rather abundant in each zoecial tube. 
Occurrence: Pierce limestone, Murfreesboro, Tennessee. 
Holotype: 44736 U. S. Nat. Mus. 
Paratype: 249-9. Indiana University. 
Batostoma inutilis n. sp. Plate X, Figs. 4-5. Zoarium is smooth ramose 
dividing dichotomously every 6 to S mm. into compressed branches 4 to 5 
mm. in greatest diameter. 
Zoercia are polygonal to circular, 7% to 8 in 2 mm. Mesopores are abun- 
dant in some parts of the mature zone, separating the zoecia completely, and 
in other area, they occupy the angular spaces only. The acanthopores are 
of medium size, distinct and few, one among ten zoecia. They occasionally 
inflect the zoecial walls. 
In the axial region, the walls of the zoecia are thin and wavy. Meso- 
pores are absent and diaphragms are very rare. The tubes proceed to the 
mature region in an undulating curve. A decided increase of curvature, the 
