216 PALEONTOLOGY OF OHIO. 



minute circular pores, whicli appear to be the openings of coenenchymal 

 tubuli, and similar pores exist every where between the corallites which 

 are placed in the intervals between the different stars. Each star is (in 

 the best preserved portions of the coral) circumscribed and separated 

 from the adjacent stars by a distinct hexagonal border, which has no 

 great width, and is occupied solely by the coenenchymal tubuli, and not 

 by the ordinary corallites. 



Though undoubtedly closely allied to Oonstellaria antheloidea, Hall, it 

 seems to me that 0. polystomella is sufficiently distinguished by the fact 

 that the different stars are definitely bounded in the latter and appear 

 to occupy definite polygonal areas, whilst in the former no line of de- 

 markation can be detected between the different stars other than that 

 afforded by the outer terminations of the elevated ridges. In addition 

 to this character, however, the present species would seem to be distin- 

 guished by its very prominent stars, bj' the large number of rays which 

 are generally present ' in each individual star, and by the conspicuous 

 presence, both in the central areas of the stars and also in the interspaces 

 between the difierent corallites elsewhere, of very numerous and very 

 minute cylindrical tubuli, which can hardly be regarded as other than 

 coenenchymal. 



The only example of this species that I have seen was collected by 

 Mr. U. P. James, of Cincinnati. 



Position and locality : Eare in the Cincinnati group, Cincinnati, Ohio. 



Genus AULOPORA, Goldfuss, 182Q. 



(Petref. Germ., p. 32.) 



AULOPOEA AEACHNOIDEA, Hall. 



Plate 23, figs. 1, 16. 



Aulopora arachnoidea, Hall ; Pal. N. Y., Vol. I., p. 76, pi. 26, figs. 6a, 6c. 



Corallum very slender and delicate, attached to the surface of foreign 

 bodies, repeatedly branching, and, in many examples, anastomosing to 

 form a close net-work. The branches are usually given oflf at intervals 

 of from one-third to two-thirds of a line, and are linear and very narrow. 

 The corallites have much the characters of the uniserial forms of Alecto, 

 being arranged in single lines, and opening in the axis of the branches. 

 The terminal portion of the corallite is elevated above the general sur- 

 face, and the calices are circular and not expanded. About four or five 

 calices occupy the space of one line. 



