476 Prof. F. M'Coy on some new Silurian Radiata. 



plicated edges of the radiating lamellae), from thence to the 

 walls made up of small, thick, rounded, vesicular plates, the 

 obscure rows having a slight downward curve. 



One worn specimen from Dudley, in the collection of Count 

 Miinster, was considered by him and Dr. Goldfuss to be a variety 

 of the Cyathophylliim diantlius (Goldf.) of the Devonian rocks, 

 from which I tind it diflFers generically. 



Not uncommon in the Wenlock limestone of Dudley, Stafford- 

 shire. 



{Col. University of Cambridge.) 



Ccenites strigatus (M'Coy). 



Sp. Char. Corallum forming cylindrical, dichotomous branches, 

 2 to 3 lines in diameter ; surface with small, narrow, trian- 

 gular cells, the base of the triangle below, and the apex usually 

 more or less prolonged upwards into a vermiform channel, 

 often upwards of half a line long ; four to live rows of cells in 

 the space of 1 line, measured ti'ansversely, about two in the 

 same space measured longitudinally ; compact interstitial space 

 between the rows of cell-openings usually rather exceeding 

 their width. 



The usual compact appearance of the Ccenites, combined in this 

 species with the interrupted scratch-like channels of the cell- 

 mouths, completely distinguish it from any species of Favosites 

 or Stenopora. 



Not uncommon in the Wenlock limestone of Dudley, Stafford- 

 shire. 



(Cul. University of Cambridge.) 



Pakeoporu sub tills (M'Coy). 



Sp. Char. Corallum forming cylindrical bi'anches, usually l^^ to 

 2 lines in diameter ; large stellular tubes about one-sixth of a 

 line in diameter, and a little more or less than their diameter 

 apart ; polygonal intervening tubuli invisible to the naked e^'e, 

 usually five between adjacent cell-tubes, or about thirty in the 

 space of 1 line ; three cell-tubes with their intervening tubuli 

 in a space of 1 line ; main tubes often weathering as separate 

 sulcated columns. 



In the middle of the branches the cell-tubes seem to be 

 parallel and vertical, but diverge rapidly at the circumference to 

 reach the surface ; they are very often weathered as separate tu- 

 buli, as in P. subtubulata and P. tubulata, and on the other hand 

 they often break away from casts of the surface, leaving so little 

 trace among the intervening tubuli, that the ,surface seems merely 

 shagveencd under the lens, bearing some resemblance to the 



