34 Cincinnati Society of Natural History. 



P'ormation and Locality. — Lower Silurian, Trenton Gr., Ken- 

 tucky, Cincinnati Gr., Covington and Frankfort, Kentucky, and 

 Cincinnati, O. 



57. M. (Fisiulipora) oweni, U. P. James. 



FistuUpora oweni, Jame.s. Jour. Cin.Soc. Nat. Hist. VI I, 21, 

 1884. 



Corallum in flat, twisted expansions, one-half aline to one line 

 in thickness, sometimes lobate, or in sub-cylindrical, hollow tubes. 

 Surface with clusters of eight or ten projecting apertures, some- 

 times regularly and again irregularly arranged. Maculae about one 

 line apart, and about one-half a line across; interstitial spaces occu- 

 pied by small pores. Corallites springing from a delicate striated 

 epitheca. Calices sub-oval, or sub-circular. Walls thin, but thicker 

 on one side than on the other. Tubes slightly curved at the base, 

 then vertical to the surface. 



Obs. This species, though similar in some respects to the pre- 

 ceding, can be separated from it by the twisted corallum, and by 

 the maculae being made up of from but eight to ten tubuli instead of 

 a considerable number, sometimes thirty. 



Formation and Locality — Lower Silurian. Cincinnati Group, 

 Lebanon, Ohio. 



58. M. (Fistulipora) AI.TERNATA, U. P. James. 



Ccramopora altcrnata, James. The Paleontologist, p 5, 1878. 



Corallum forming branching cylindrical or compressed, gener- 

 ally hollow stems, one to four lines in diameter, often filled with 

 clay or some other foreign substance. Surface sometimes with 

 slighdy elevated spots, bearing few cells, and a greater or less num- 

 ber of smaller pores. Calices in perfect specimens sub-circular or 

 oval, elevated, and slightly oblique or arched ; generally arranged 

 in alternating, but sometimes in diagonal rows around the branches. 

 Interstitial pores numerous on worn specimens. (Plate i, figs. 5, ^a.b). 



Obs. This species may generally be recognized by the maculae 

 when present, being made of both large and small tubuli. The 

 apertures, too, are slighdy arched, and arranged in lines or rows 

 round the branches. 



Formation and Locality. — Lower Silurian, Cin'ti (Groups, 

 Cincinnati, O. 



59. M. (Fistulipora) nicholsoni, U. P. James. 

 Ccrampora nicholsoni, James. Cat. Foss, Cin. Group, p. 3, 



1875- 



