COEALS OF THE CORNIFEROUS LIMESTONE. 241 



the exterior surface. The chief character which separates such a speci- 

 men from A. profunda, Hall, is the larger size of the corallites, which 

 vary from three to ten lines in diameter, and the zigzag undulations of 

 the outer walls. 



Position and locality : Corniferous limestone, Sandusky, Ohio. 



Genus SYRINGOPORA, Goldfuss, 1826. 

 Syeingopora Maclueei, Billings. 



Syringopora tubiporoides, Billings; Canadian Journal (new series), Vol. IV., p. 115, 



fig. 17. 

 Syringopora Maclurei, Billings; Ibid., Vol. V., p. 258. 

 Syringopora Maclurei, Nicholson ; Eept. on the Palteontology of Ontario, p. 41. 



Corallum of long, slightly flexuous corallites, which have a diameter 

 of from a line to as mach as a line and a half, and which may be nearly 

 in contact, or may be separated by intervals of from two to four lines 

 apart. The connecting processes are usually short and inconspicuous, 

 and often look like mere inosculations of the adjacent corallites, their 

 distance apart varying from three lines to as much as one inch. Epitheca 

 with numerous encircling strias, and occasionally with obscure longitud- 

 inal striae in addition. 



This species is most nearly allied to S. perelegans, Billings, from which 

 it differs in its more robust, more flexuous and less regularly disposed 

 corallites, and in the less highly conspicuous connecting processes. The 

 specimens from Ohio are quite similar to those from Canada, except that 

 they are perhaps slightly more regular in their growth than is usually 

 the case with the latter. 



Position and locality : Corniferous limestone, Sandusky, Ohio. 



Genus PHILLIPSASTR^A, D'Orbigny, 1849. 



(Note sur des Polypiers Fossiles, p. 2.) 



Phillipsaste^a CtIGAs, Dale Owen. 



Astrsea gigas, Dale Owen ; Geol. Survey Iowa, etc., p. 70, pi. 14, fig. 7, 1844. 

 Phillipsastrxa gigas, Billings ; Canadian Journal (new series), Vol. IV., p. 128. 



Corallum forming large spherical or hemispherical masses, the surface 

 of which is covered with corallites averaging about one inch in diam- 

 eter. The width of the calices is from five to six lines, and the corallites 

 are destitute of walls and united with one another by the confluence of 



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