Paleontology of the Cincinnati Grotcp. 51 



verse section, "the sponge appears composed of labyrinthi- 

 cally intertwining vertical laminae * * * separated by 

 tortuous and almost linear interspaces, with here and there an 

 irregular angular open space. * * * The vertical fracture 

 shows that this remarkable intertwining is largely produced 

 l)y connecting processes on the sides of the laminae." 

 (American Geologist, vol. 3, 1889, p. 244.) 



1. G. RiciiMONUENSis, Miller, (sp.) 1882. 



Free, globular or sub-spherical, varying in size from two- 

 eighths to seven-eighths of an inch in diameter; consisting of 

 numerous irregularly concentric laminae, with the inter- 

 lamelar spaces filled in most cases with small twining canals 

 or minute vertical tubes ; diameter of canals 075V0 ^^ ^" inch ; 

 the vertical tubes have an average diameter of -^^ of an inch. 

 When weathered the fossil has the appearance of a Stromato- 

 pora. (Emended description, Seely, Ibid 1886, p. 32). Stroma- 

 tocerium richnoudcnsc. Miller, Jour. Cin. Soc. Nat. Hist., vol. 5, 

 1882, p. 41 ; Strephochehis richmondensis, Seely, op. cit., 1886. 



Localities. — Richmond and Madison, Indiana; Turner's Sta- 

 tion, Kentucky. 



Remarks. — The emended description by Professor Seely is 

 much better than the original. In the remarks upon it Pro- 

 fessor Seely says: " Not unfrequently it occurs as an incrust- 

 ing body, having for its core a bit of coral, or a fragment of 

 'the shell of a brachiopod. * * '■■ The tubes present great 

 uniformity of direction, though not of size. They run nearly 

 parallel with each other for a little distance, and then are cut 

 short by a laminar covering, which may be the basis for a 

 similar set of slighth' radiating tubes." (op. cit., p. 33.) 



2. G. LABVRiNTHiCA, Ulrich (sp.), 1889. 



Massive, siliceous, about 50 mm. long b}- 25 mm. wide b}' 30 

 mm. high. In vertical .section appear labyrinthicall}' inter- 

 twining vertical laminae, about 0.3 mm. thick, separated by 

 tortuous and almost linear interspaces, with an occasional 

 angular open space, i mm. in length. (American Geologi.st, 

 vol 3, 1889, p. 244) Strcptospongia labyrintliica, Ulrich. 



Locality. — Near Lebanon, Kentucky. 



Remarks. — This differs from the first described .species 

 mainly in form, being massive, instead of oval and free. 



