198 SYSTEMATIC PALEONTOLOGY 



COELENTERATA 



CLASS ANTHOZOA 



Subclass TETRACORALLA 



Family CYATHOPHYLLIDAE 



Genus GOLUMNARIA Goldfuss 

 COLUMNAKIA (?) HALLI Nicholson 



Plate XLI, Fig. 5 



Columnaria alveolata Hall, 1847, Pal. New York, vol. i, p. 47, pi. xii, 



figs, la-lc. (not Goldfuss). 

 Columnaria (?) halli Nicholson, 1879, Tab. Corals Pal. Period, p. 198, text 



figs. 28, 2; p. 200, text fig. 29; pi. x, figs. 3, 3a. 

 Columnaria (?) halli Winchell and Schuchert, 1895, Geol. Minnesota, Pal., 



vol. iii, pt. 1, p. 85, pi, G, figs. 14-16. 



Description. " Corallum forming large massive colonies which vary 

 from a few inches to several feet in diameter, and which are composed of 

 various sized polygonal corallites, in close contact with one another 

 throughout their entire length. The walls of the corallites are not 

 excessively thickened, and they are so completely amalgamated in con- 

 tiguous tubes that even under the microscope the original lines of 

 demarcation between the tubes can be made out with difficulty or not at 

 all. The large tubes are usually from two to three lines in diameter, 

 though occasionally considerably more than this, and the smaller 

 corallites are of all sizes. Septa marginal, in the form of obtuse longi- 

 tudinal ridges which vary in number from 20 to 40, do not extend to 

 any distance into the visceral chambers, and are not divisible into an 

 alternating longer or short series. Tabulae strong, horizontal and com- 

 plete, about half a line apart or sometimes closer. Mural pores not 

 recognized with certainty." Winchell & Schuchert, 1895. 



Occurrence. CHAMBERSBURG LIMESTONE ( Caryocystites bed). From 

 Fort Loudon south to Blue Spring, Franklin County, Pennsylvania. 

 Generally an abundant fossil in the Mohawkian rocks of Canada and the 

 United States. 



Collections. Maryland Geological Survey, U. S. National Museum. 



