294 . 



walls are wavy, constricted at the diaphragms. In the completely developed 

 zioecia 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 luimerous 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 fi-ee portion is supiwrted by the next diaphragm below. Mesopores are 

 few, beaded, of irregular shapes and sizes, present in the submature and 

 mature region. 



Batostoma snbcrassum 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. 



Occurrence : This species is abundant in the Pierce limestone, one and 

 three-foiirtlis miles north of Eagleville. Rutherford County, Tenn. 



HolotyiH': C. S. Xat. Mus. 



Paratype : 242-7. Indiana University. 



Batostoma denclroidea n. sp. Plate IX, Figs. 4-5. Zoarium has an even 

 surface (spinulose in w-ell preserved si)ecimens), short branches, irregularly 

 arranged, varying from 3 to 10 mm. in diameter, but in most specimens 5 

 to 8 nun. The numerous short branches give a knotty appearance to the 

 zoarial mass. 



The zoecia are angular, thick-walled, nearly everywhere in contact, and 

 7 to S in 2 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 to 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. 

 Paratypes : 241 — 14, 15 ; 24G — 1. Indiana University. 

 Batostoma ramosa ti. sp. Plate IX, Figs. 0-7. Zoarium is smooth, ramose, 



