284 Prof. F. IVPCoy on some new genera 



it is difficult to be satisfied about the connecting pores, but from 

 the appearance under a high jjower of several specimens, I have 

 little doubt they are as in the above notice. 



In great abundance clustered like Nummulites in some parts of 

 the fine Caradoc sandstone of Horderly West ; more rare in the 

 schists of Moel Uchlas 't ; Pont y Glyn, Diff'vvys ; Cwra of the 

 Cymmerig. 



Nebulipora papillata (M'Coy). 



Sj). Char. Corallum forming very thin layers (usually coating 

 Orthoceratites) ; clusters of large cells elevated into conical 

 papillae, about ten in each cluster ; the papilla a little wider 

 than high, usually about twice their diameter apart, quincun- 

 cially arranged ; thickness of corallum usually less than half a 

 line, diameter of papillae about half a line, distance apart 

 about one line ; of the smaller cells about nine or ten occupy 

 one line. 



Not very uncommon coating Orthoceratites in the Upper Lud- 

 low rock of Brigsteer, and Coniston flags of Coniston, also at 

 Fir bank. 



Favosites crassa (M'Coy). 



Sp. Char. Corallum forming large, subcylindrical, curved 

 branches, composed of long, slightly diverging, remarkably 

 regular and equal prismatic tubes, opening as thin-walled 

 polygonal cells on the surface, with a nearly uniform diameter 

 of half a line ; two rows of pores on each face of the prismatic 

 tubes, diaphragms either slightly more or less than the dia- 

 meter of the tubes apart ; interpolated young tubes few. 



In the general characters of the tubes and connecting foramina 

 this species neai'ly agrees with F. Gothlandica, from which spe- 

 cies it is distinguished by the elongate branch-like form of the 

 general mass, the tubes averaging rather less than half the dia- 

 meter, and being far more uniform in size than in that species, 

 from the small number of interpolated young tubes, connected 

 probably with the shape of the corallum, which is elongated instead 

 of forming low wide masses as in F. Gothlandica, I suspect this to 

 be the coral occasionally quoted as the Devonian F. polpnurpha 

 in Silurian rocks, a species which is very distinct fi'om the pre- 

 sent, and which I have never seen in Silurian strata, nor seen 

 any recognizable figure of a Silurian specimen. As the essential 

 characters are neither described nor figured, I do not like to refer 

 to the figure (t. 15. f. 2) of the so-called F. jwlymojpha given 

 by Mr. Lonsdale in the ' Sil. Syst,,^ placed in the genus Alveolites 

 by M. D^Orbigny under the name (without definition) of A. 

 Lon^dalii, although the size of the tubes coincides. 



Masses 2 inches in diameter and 6 inches long in the Coniston 

 limestone, Coniston Water. 



