76. CONTRIBUTION TO 



CERATOPORA SEPARATA, N. Sp. 



Plate 25. Figs. 5-6 



Corallum growing somewhat loose, rapidly increasing b}'- lateral gemma- 

 tion. Corallites short, cylindrical, more or less flexuous, with numerous broad, 

 rounded annulations, and shallow constrictions, occasionally the walls are in 

 contact their entire length; in other portions of the same corallum, the stems 

 are free and in some places they are distant a tube diameter. The bases of the 

 tubes rarely ever exceed two millimeters in diameter, gradually enlarging to 

 the calyx. Diameter of calyx from three to five millimeters. Tabula3 funnel- 

 shaped, and from the highly silicified condition of the coral, they appear like 

 the vesicles in the cup of a Cystiphyllum. The spines or trabecuhe have been 

 destroyed through silicifieation. 



This is so unlike any other species of Ceratopora, found in the Hamilton 

 group, that a comparison is unnecessary. 



Found in the Upper Devonian (Hamilton group) at Charlestown, and in the 

 strippings above the Cement rock, throughout Clark county, Ind. Now in the 

 collection of the author. 



CERATOPORA NANUS, N. Sp. 



Plate 25. Figs. 7, 8, 9-10. 



Corallum small, increasing by lateral gemmation from the basal portion of 

 the parent tubes. Basal portion of all the corallites broad, with a strong 

 ■wrinkled epithecal crust. Tubes rounded, with numerous strong rounded an- 

 nulations, and rough wrinkles, caused by periodical growth. The length of 

 the corallites varies in dilTerent corallums, even in the same corallum, from 

 four to eleven millimeters in length, in the longest tubes observed. Diameter 

 of tubes from four to five millimeters. In some examples the tubes are con- 

 nected throughout their entire length, while in others, after leaving the parent 

 tube, they are free; this is the case sometimes in the entire corallum. Tabulae 

 when present, is concave or oblique; but in many tubes it is so intimately con- 

 nected with the basal portion, that it can not be determined. The walls of 

 the tubes when well preserved, are decorated with numerous fine longitudinal 

 granulose lines, instead of spinules, as shown in other forms of Ceratopora. 



Found in the Upper Devonian (Hamilton group), at Charlestown, and m 

 the strippings above the cement beds, throughoxit Clark county, Indiana. Now 

 in the collection of the author. 



