1884.] NATURAL SCIENCES OP PHILADELPHIA. 147 



cells rhomboid, becoming gradually quadrangular towards the 

 centre. 



FUNGISPONGIA (n. gen.) 



Flattened ; spreading from a fixed point ; thinning out at the 

 margin. 



From the attached portions, numerous perforations, with 

 smooth walls, radiate and branch out with many bifurcations 

 and anastomoses in all directions towards the periphery, having 

 numerous communications with the outer surface, which is quite 

 smooth. 



Fungispongia irregularis (n. sp.) PI. Ill, fig. 3. 



Flat, rather thin, irregularly spreading from a lateral or excen- 

 tric point of growth. Surface moderately convex ; rather abruptly 

 beveled off to a sharp margin, which is somewhat irregular in 

 contour. Internal structure consisting of small, closely arranged 

 radiating perforations, which, though apparently of a quite regular 

 circular form separately, are very irregular in section, in conse- 

 quence of the frequent bifurcations and intercommunications 

 occurring in their outward course. They do not always open 

 directly upon the rather smooth surface, but are directed outwards 

 towards the margin and frequently' end in furrows on the outside. 



The specimen from which this description is taken, is some- 

 what weathered in the central part, so as to well show its struc- 

 ture. From the siliceous bands of the Clinton at Lockport. 



Niagara Transition Group. 



Stictopora graminifolia (n. sp.). Pi. ITT, fig. 4. 



Very long and narrow, ribbon-like ; width one-eighth inch, 

 even throughout, flat on the noncellular and slightly convex on 

 the cellular side. 



The striae of the lines of growth are abruptly arched in the 

 centre, where they are accompanied by undulations of the surface 

 having the same general curve, but which are confined to the 

 central portion ; the stride grow more crowded as they gradually 

 approach the margin, which they continue to do for a distance 

 about equal to the width of the flat surface, where they become 

 lost just before reaching it by being merged with others in 

 common longitudinal strise, which extend some distance down the 

 side before they become finally lost. 



