458 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [May 20, 



Plate XVI. 



Fig. 1. Placocyatkus Barretti (part of a corallite) : a, lateral view; b, calice 

 (both diminished f ths) ; c, the columella and one of the pali, mag- 

 nified 2 diameters. 



2. Placotrochus alveolus : a, part of a calice, of the natural size ; b, cross- 



section, magnified 2 diameters. 



3. Thysanus excentricus : a, calice ; b, lateral view of a corallite (both of 



the natural size) ; c, costa, magnified 2 diameters. 



4. Stylopkora affinis ; calice, magnified 10 diameters. 



5. Siderastrcea (Astraa, Edwards &Hstime) yrandis: a, longitudinal view 



of the septa ; b, transverse section of corallites ; both magnified 

 4^ diameters. 



6. Montlivaltia ponderosa : a, a young corallum, of the natural size ; b, 



calice, of the natural size. 



May 20, 1863. 



Sir Charles Tilston Bright, C.E., 12 Upper Hyde Park Gardens j 

 James Dees, Esq., C.E., Whitehaven ; E. C. Hartsincke Day, Esq., 

 Charmonth; W. Dickinson, Esq., M.A., Croydon; Robert Francis 

 Hodgson, Esq., 126 Marine Parade, Brighton ; the R»v. Charles 

 Kingsley, M.A., F.L.S., Rector of Eversley, Hants, and Professor 

 of Modern History in the University of Cambridge ; Edward Coulson 

 Musson, Esq., B.A., Martyr Worthy, near Winchester; Thomas 

 Glazebrook Rylands, Esq., F.L.S., Heath House, Warrington ; and 

 John Scott, Esq., 3 Chester Place, Hyde Park, were elected Fellows. 



The following communications were read : — 



1. Further Observations on the Devonian Plants of Maine, Gasp£, 

 and New York. By J. W. Dawson, LL.D., F.R.S., F.G.S., 

 Principal of M'Gill University, Montreal. 



[Plates XVII.-XIX.] 



Contents. 



I. Introduction. , I III. Gaspe, Canada. 



II. Perry, Maine. IV. New York. 



V. Conclusion. 



§ I. Introduction. 



Since the preparation of my paper " On the Devonian Flora of 

 North-eastern America," published last year*, I have been enabled to 

 explore more thoroughly than heretofore the plant- bearing beds at 

 Perry, in Maine ; and Mr. R. Bell, of the Geological Survey of Canada, 

 has collected some interesting specimens from the Gaspe sand- 

 stones, which have been kindly placed in my hands by Sir W. E. 

 Logan for determination. Some important facts have also been as- 

 certained respecting the distribution of the Devonian rocks of the 

 State of New York, which give to several of the Plants from that 

 region a somewhat older geological position than that assigned to 



* Quart. Journ. Geol. Soc. vol. xviii. p. 296. 



