On the Norian or "Upper Lauventian " Formation. 277 



fore-wing ; but unfortunately it exhibits in full only the 

 principal cells. These are enough to show that it is a 



Phryganea ejecta, n. sp. 



caddis-fly, and that it falls 

 near, if not in the genus 

 Phryganea proper, but it 

 differs in important points 

 from all the species I have 

 examined in the Museum 

 of Comparative Zoology at 

 Cambridge, containing the 

 large collection of the late 

 Dr. Hagen. The differences 

 consist principally in the 

 great length of the thyri- 

 dial area and of the median 

 cellule, so that the distal 

 termination of the lower 



cellules is much farther removed from the base of the 

 wing than is that of the upper. It represents a tolerably 

 large species, the preserved fragment being 10 mm. long, 

 and the probable original length of the forewing at least 

 15 mm. It may be called Phryganea ejecta. 



On the Norian or " Upper Laurentian " For- 

 mation of Canada. 



By Frank D. Adams, M.A.Sc, Ph.D. 



(Translated from the German by N. J. Giroux, Esq., C.E., of the 

 Geological Survey of Canada.) — Continued. 



The Structure of the Morin Anorthosite and a Com- 

 parison OF THE SAME WITH THE STRUCTURE OF CERTAIN 

 EOCKS IN OTHER PLACES. 



If a large smooth weathered surface of anorthosite, as 

 it is found in the " Eoehes Montonnees " throughout the 

 Morin area, be examined, leaving out of consideration for 



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