50 KENTUCKY GEOLOGICAL SURVEY. 



CALLOPORA NODULOSA (NICHOLSON). 



Plato 2, figs. 8, 9. 

 Chastetes nodulosus. Nicholson, Paleontology of Ohio, vol. 2, p. 200, pi. xxi, 



10, lOa, 1875; Annals and Magazine of Natural History, ser. 4, vol. 18, 



p. 87, pi. v. 3, 1876; 

 Monticulipora (Heterotrypa) nodulosa. Nicholson, Genus Monticulipora, p. 



116, pi. i, 4-4d, 3881. 



Zoarmni raniose, of small, cylindrical, dichotomously branch- 

 ing stems, from 1.5 to 3 mm. in diameter. Surface with numer- 

 ous prominent conical monticules about 1 mm. apart. Aper- 

 tures oval, with their longer diameter in the direction of the 

 branch, about 6 in 2 mm., measuring longitudinally. Mesopores 

 numerous. Zooecia with thin walls and few diaphragms in the 

 axial region; the latter become more numerous and the walls 

 are thickened as the surface is approached. Mesopores with 

 closely set diaphragms. 



Occurrence : Common in the upper Eden in Ohio and north- 

 ern Kentucky ; a somewhat more robust form occurs in the lower 

 Mount Hope beds of the Maysville group in the same area. 



CALLOPORA SIGILLARIOIDES (NICHOLSON). 



Plate 2, figs. 10, 11. 

 Chaetetes sigillarioides. Nicholson, Paleontology of Ohio, vol. 2, p. 203, pi. 



xxii, 9, 9a, 1875; Annals and Magazine of Natural History, ser. 4, vol. 18, 



p. 87, pi v, 2, 1876. 

 Monticulipora (Heterotrypa) O'Nealli (not of James). Nicholson, Genus 



Monticulipora, p. 118, pi. iii, 3-3f, 1881. 



Zoarium ramose, consisting of small, dichotomously divid- 

 ing branches, from 2 to 4 mm. in diameter. Surface smooth, 

 except for scarcely elevated clusters of larger cells. Apertures 

 oval, their long axes in the direction of the branch, about 6 in 2 

 mm., measuring longitudinally, and 8 in 2 mm. transversely. 

 Among the apertures are the circular openings of a considerable 

 number of mesopores. Diaphragms few in the axial region, 

 rather numerous in the mature region. The mesopores have 

 closely set diaphragms. 



