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walls are wavy, constricted at the diaphragms. In the completely developed 
zoecia of the axial region the diaphragms are from 2 to 5 tube-diameters 
apart with no constriction of the walls. The zoecia proceed forward in a 
broad curve and approach the surface at an acute angle. Diaphragms are 
more numerous in the mature zone than elsewhere, 2 to 3 in one tube-diam- 
eter with occasionally 1 or 2 incomplete ones in some of the zoecial tubes ; 
the free portion is supported by the next diaphragm below. Mesopores are 
few, beaded, of irregular shapes and sizes, present in the submature and 
mature region. 
Batostoma suberassum is distinguished from B. magnopora in the singu- 
lar approach of the zooecia to the surface, the thicker walls, more numerous 
diaphragms in the axial region and the absence of monticules. 
Oceurrence: This species is abundant in the Pierce limestone, one and 
three-fourths miles north of Eagleville, Rutherford County, Tenn. 
Holotype: U.S. Nat. Mus. 
Paratype: 242-7. Indiana University. 
Batostoma dendroidea n. sp. Plate IX, Figs. 4-5. Zoarium has an even 
surface (spinulose in well preserved specimens), short branches, irregularly 
arranged, varying from 5 to 10 mm. in diameter, but in most specimens 5 
to S mm. The numerous short branches give a knotty appearance to the 
zoarial mass. 
The zoecia are angular, thick-walled, nearly everywhere in contact, and 
7toSin2 mm. The apertures are subangular to circular. Mesopores are 
few, 1 to 2 among 10 zoecia. Acanthopores are numerous, 4 to 6 about each 
aperture, located at nearly all junction angles and occasionally between 
contiguous zoecia, inflecting the walls. 
In the axial region the diaphragms are numerous in the attenuated end 
of the zoecial tubes and very few or absent in the zoecia that have attained 
full size. The tubes pass into the mature zone with a symmetrical curve 
and proceed te the surface nearly perpendicularly. ; 
The mature zone is narrow, with 2 to 3 diaphragms crossing the zoecia 
in the distance of a single tube diameter. A few of the diaphragms are 
incomplete and coalesced with one another. The walls are greatly thick- 
ened, separated by a conspicuous median dark line. Acanthopores in the 
vertical section are distinct, many originating in the early mature region 
and do not reach the surface. In the mesopores, some of which develop 
into zoecia, five diaphragms occur in the distance of the diameter of a 
zoecial tube. 
This species possesses several characters similar to B. winchelli, from 
which it can be distinguished by scarcity or lack of diaphragms in the 
full sized zoecia of the axial region. 
Occurrence: Common in the Pierce limestone: Murfreesboro, Walter 
Hill, Wards Mill, Lascasses, Rutherford County, Tennessee. 
Holotype: 44731 U. S. Nat. Mus. 
-aratypes: 241—14, 15; 246—1. Indiana University. 
Batostoma ramosa n. sp. Plate IX, Figs. 6-7. Zoarium is smooth, ramose, 
