Palcoiitoloi^y of the Cincintiati Croup. 93 



nent. The internal structure can not be ascertained, because 

 of the presence of calcite in a crystallized form, but at one 

 point the characteristic layers of Stromatopora can be observed. 

 For this specimen the name, 5. indianicnsis is proposed, inas- 

 much as it seems to be undescribed. In its prominent monti- 

 cules it bears considerable resemblance to S. tuberculata, 

 Nicholson, but that species is parasitic, while the present one 

 is massive. 



Locality. — Near Connersville, Indiana, in the upper layers 

 of the Cincinnati Group, associated with Bcatrica nodulosa 

 and Bcllerophon bilobaliis. Collected by A. C. Benedict. 



Genus 2. — Stromatocerium, Hall, 1S47. 



Skeleton (ca^no-steum) massive, composed of dense, thick, 

 calcareous, horizontal and concentric lamina.% separated by 

 narrow and irregular interspaces ; laminae irregularly dis- 

 posed ; no radial pillars crossing interlaminar spaces ; entire 

 mass perforated by vertical tubes without walls at short and 

 irregular distances ; the tubes place the interlaminar spaces 

 in communication, but can not be said to run from top to 

 bottom. (Hall, Pal. of N. Y., vol. i, 1847, p. 48; emend., 

 Nich. & Murie, Jour. Linn. Soc. Loud., Zoology, vol. 14, 1877, 

 p. 222.) 



Remarks. — The original description of this genus was very 

 meager and unsatisfactory, and the emended one given by 

 Nicholson and Murie, as above, is preferred. It is perhaps 

 doubtful whether it occurs at Cincinnati. It is given, how- 

 ever, to serve as a means of identification in case it be found. 



I.— S. CAN.'VDKNSK, Nichol.sou & Murie, 1878. 



Skeleton (cfcnosteum) in the form of large, rounded or 

 irregular masses, composed of numerous dense, concentric 

 laminae, about five of which, (including the interlaminar spaces), 

 occupy one line ; interlaminar spaces open, without radial 

 pillars; the whole mass transversed by numerous di.scon- 

 tinuous vertical canals, J„ to „V "^ ^" i"ch or less in diam- 

 eter. (Ibid., p. 223.) 



Locality. — Peterborough, Ontario. 



