CORALS AND BRYOZOA. 33 



CERAMOPORA, Hall. 1852. 



Ceramopora macolata. 

 plate xvi, figs. 5-11. 



Ceraiaopora vutculata. Hail. Twenty-sixth Kept. N. Y. State Mus. Nat. Hist., p. 106. 1874. 



Thirty-second Rept. N. Y. State Mus. Nat. Hist., p. 159. 1879. 

 Report of State Geologist for 1882. Expl. pi. 16, figs. 5-11. 188a. 



ZoARiUM discoidal, flattened or concave on the lower side; base attached at 

 the center to some foreign body, frequently a fragment of a crinoid stem or 

 a small gastropod ; the remaining portion free, covered by a strongly wrin- 

 kled epitheca. Thickness of zoarium from 1 to 5 mm. Cells tubular, 

 polygonal, arising from the epitheca, and radiating from the center, regularly 

 curving to the surface ; in the center being at right angles to the epitheca, 

 and gradually becoming more oblique as they approach the margin. Apertures 

 from .45 to .50 mm. in diameter, on some portions of the frond distinctly 

 alternating and imbricating. There are slightly elevated circular monticules, 

 the centers of which are distant about five mm., upon which the cells are 

 slightly larger than on other portions. 



This species resembles C. imhricata of the Niagara limestone, but differs in 

 the less distinctly cucullate apertures, it also grows to a much larger size. 



Formation and localities. Lower Helderberg group, Clarksville and Schoharie, 

 N. Y. 



Ceramopora labeculoidea. 



PLATE XVI, FIGS. 1, 2. 



Ceramopora labeculoidea. Hail. Thirty-second Rept. N. Y. State Mus. Nat. Hist., p. 158. 1879. 

 " " •' Report of 8t*te Geologist for 1882. Expl. pi. 16, figs. 1, 2. 1883. 



ZoARiuM consisting of very thin, circular, lamellate expansions. Under sur- 

 ftice a concentrically wrinkled epitheca. Cells short, tubular, alternating, 

 imbricating and oblique to the surface; more or less regularly radiating from 

 the center to the margin of the expansion. Apertures arched or triangular, 

 with two minute denticulations ; width .33 ram. Surface marked by acellu- 

 lar maculae ; the apertures immediately adjacent to these are a little larger 



