NATURAL HISTORY SOCIETY OF GLASGOW. 83 



deceptive appearance of being perforated. These two species of 

 Fenestella, along with some others, Mr Young hoped would be 

 figured and more fully described by Dr Young and himself in the 

 next part of the Society's Proceedings. 



Mr Young also stated that on the fronds of the various species 

 of Fenestella from the Gillfoot shales numerous polyzoan processes 

 — the so-called Palceocoryne of Messrs Duncan & Jenkins — are 

 to be found. These authors say that Palceocoryne "sat upon, 

 covered, and destroyed numerous cells of the polyzoon," but after a 

 careful examination of his specimens, he was prepared to show 

 that this statement of Messrs Duncan & Jenkins is incorrect. 

 These polyzoan processes are found to proceed as often from the 

 non-poriferous as from the poriferous face of the Fenestella. This 

 being the case, it must be self-evident that the processes which 

 proceed from the non-poriferous face, could not sit upon or cover 

 any of the cell openings, and he found, as a rule, that they in no 

 way interfered with the regular arrangement of the pores on the 

 other side of the frond. When the processes proceed from the 

 poriferous face, well-preserved specimens in his collection also 

 show that the cell openings are not closed up nor interfered with ; 

 the series of pores being continued as usual alongside of the 

 processes. Such being the case, and the above remarks applying 

 only to those processes that proceed at right angles from the faces 

 of the fronds, and not to the marginal processes, there is no 

 evidence, as seen in the best preserved specimens, for the assertion 

 that the so-called Palceocoryne was an organism independently 

 attached to the fronds of Fenestella. 



Mr D. C. Glen, F.G.S., exhibited a weathered specimen of a 

 Silurian coral, from Lake Huron, Canada, belonging to the genus 

 Favosites, showing in a very clear manner the tabulate structure 

 of the coral. Mr Glen stated that most of the corals from the 

 above region are filled to a certain extent with silica, which has 

 penetrated the structure, thus enabling the coral, while weathering, 

 to resist the action of the atmosphere more thoroughly than when 

 it is composed of calcite. 



Mr James Lumsden, F.Z.S., exhibited an example of malforma- 

 tion in the bill of the Rook, Corviis frugilegus, and remarked that in 

 this specimen the lower mandible was imperfect at the point, and 

 the upper one had grown down in such a way that it projected 

 more than an inch beyond the other. It was also worthy of 



