i899] 217 



Platf. VIII, Fig. 2. — Autoclastic rock ; lot 13 con. XIX of Tudor ; the illustration 

 shows, in detail and on a much larger scale, a more advanced stage in the deform- 

 aiion of one of the elongated individuals of micro-granitite. It is evident from 

 this that the rounded outline is imparted to the fragments at a very early stage in 

 the process. 



Plate IX, Fig. I — Autoclastic rock ; lot 13 con. XIX of Tudor. The matrix is 

 the same dark grey mica-schist already mentioned, while the lenticular shape of 

 them ore brittle dyke bands are shown. In cross section as also shown these same 

 individuals exhibit a more or less perfect rounded outline. 



Plate IX, Fig. 2. — Autoclastic rock ; lot 13 con. XIX of Tudor. This specimen 

 exhibits in great perfection one phase of the rock, where it has undergone the 

 extreme of deformation. The supposed pebbles in reality represent what were once 

 practically continuous more or less parallel dykes of micro-granitite, which owing 

 to differential movement and stretching have become gradually so distorted and 

 displaced that the resulting rock mass is undistinguishable frcm singular exposures 

 of similar rucks which are clearly the result of littoral action. 



ON SOME SPECIES OF CANADIAN PALyEOZOIC 



CORALS.* 



By Lawrence M. Lambe, F. G. S. 



In the following paper on a few species of corals from the 

 Palaeozoic rocks of Canada attention is drawn to certain struc- 

 tural details overlooked or misinterpreted in the original descrip- 

 tions of some of the species. Supplemental descriptions of others 

 have been induced by the further study of the type specimens 

 or by information derived from additional material available 

 since the species were first described. A description is also given 

 of a supposed new species. 



COLUMNARIA RUGOSA, Billings, sp. 



PalcBophylltim rugosum, Billings. 1858. Rep. of Progress for 

 1857, Geol. Survey of Canada, p. i68. 



Columnaria erratica, Billings. 1858. Ibid, p. 166. 



The generic characters ascribed to the genus Pal(Eophylluin 

 were — "Corallum fasciculate or aggregate ; corallities surrounded 

 by a thick wall ; radiating septa extending the whole length ; 



* Communicated by permission of the Director of the Geological Survey oi 

 Canada. 



