No. 8.] DAWSON — GRAPTOLITES. 461 



NOTICE OF GRAPTOLITES OF THE QUEBEC 



GROUP COLLECTED BY Mr. JAMES RICHARDSON 



FOR THE PETER REDPATH MUSEUM. 



By J. W Dawson, LL.D., F.R.S. 



As it seemed appropriate that a portion of the Logan Memo- 

 rial Collection should consist of the fossils of Sir William's 

 "Quebec Group," of which, after the removal of the Geological 

 Survey, no adequate collections existed in Montreal, Mr, Rich- 

 ardson, late of the Geological Survey, kindly undertook to pro- 

 cure specimens for the Museum. Mr. Richardson visited for 

 this purpose the rich graptolitic localities at Levis, and also 

 a locality recently discovered by himself near Mataue. The 

 result has been the accumulation of a large collection, part of 

 which is already arranged in the Museum. 



In addition to the collection of specimens, Mr. Richardson's 

 labors have given us some new facts respecting the graptolitic 

 fauna of Canada, which may be noticed here in advance of more 

 detailed study of the collections. 



The original locality in the river cliffs at Levis, which 

 afforded the greater part of the species described by Prof Hall, 

 in the decades of the Geological Survey of Canada, constitutes a 

 distinct graptolitic zone extending for a considerable distance 

 along the river front of Levis, and affording species of a number 

 of genera, among which are present, though comparatively rare, 

 Phyllograptus^ Didymogrcqytus and Tetragraptus. 



Farther inland, near Fort No. 2, in beds of dolomitic shale, 

 associated with limestone conglomerate, but whose precise stra- 

 tigraphical relation to the shore beds has not yet been determined, 

 Mr. Richardson has found a second zone crowded with PhijUo- 

 graptiis ti/pus, mostly of the narrower variety, and abounding in 

 specimens of Tetragraptus brijonoides and more rarely T. Bigshli. 

 These beds also hold a Dictyonema of the type of D. Sociale, 

 but distinct.^ There seems good reasons to believe that these 



* This species has beeu named D. delicatuhcm, and may be thus de- 

 cribed : — General form funnel-shaped in small specimens, apparently 

 flabellate in old specimens. Length of a large specimen ten centi- 

 metres, breadth at top about the same. Texture very delicate, the 



