Geological Society of London. 233 



2. " The Gold-leads of Nova Scotia." By Henry S. Poole, Esq., 

 M.A., F.G.S., Government Inspector of Mines. 



The author remarked upon the peculiarity that the gold -leads of 

 Nova Scotia are generally conformable with the beds in which they 

 occur, whence Dr. Sterry Hunt and others have come to the conclu- 

 sion that these auriferous quartz veins are interstratified with the 

 argillaceous rocks of the district. With this view he does not agree. 

 He classified the leads in these groups according to their relations to 

 the containing rocks, and detailed the results of mining-experience 

 in the district, as showing the leads to be true veins by the following 

 characters : — 1. Irregularity of planes of contact between slate and 

 quartz ; 2. The crushed state of the slate on some foot- walls ; 

 3. Irregularity of mineral contents ; 4. The termination of the 

 leads ; 5. The effects of contemporary dislocations ; 6. The influence 

 of strings and offshoots on the richness of leads. The author further 

 treated of the relative age of the leads and granite, and combated 

 the view that the granites are of metamorphic origin, which he 

 stated to be disproved by a study of the lines of contact. He also 

 noticed the effects of glaciation on the leads, and the occurrence of 

 gold in Carboniferous conglomerate. 



3. " On Conodonts from the Chazy and Cincinnati groups of the 

 Cambro-Silurian, and from the Hamilton and Genesee-Shale divi- 

 sions of the Devonian, in Canada and the United States." By 

 G. Jennings Hinde, Esq., F.G.S. 



After a sketch of the bibliography of the subject, the author 

 described the occurrence of Conodonts. In the Chazy beds they 

 are associated with numerous Leper ditice, some Trilobites, and 

 Gasteropods ; in the Cincinnati group with A*arious fossils ; and in 

 the Devonian strata principally with fish-remains ; but there is no 

 clue to their nature from these associated fossils. They possess the 

 same microscopic lamellar structure as the Russian Conodonts 

 described by Pander. The various affinities exhibited by the fossil 

 Conodonts were discussed ; and the author is of opinion that though 

 they most resemble the teeth of Myxinoid fishes, their true zoological 

 relationship is very uncertain. The paper concluded with a classifi- 

 cation of the Conodonts from the above deposits. 



4. " On Annelid Jaws from the Cambro-Silurian, Silurian, and 

 Devonian Formations in Canada, and from the Lower Carboniferous 

 in Scotland." By G. Jennings Hinde, Esq., F.G.S. 



After referring to the very few recorded instances of the discovery 

 of any portions of the organism of errant Annelids as distinct from 

 their trails and impressions in the rocks, the author noticed the 

 characters of the strata, principally shallow-water deposits, in which 

 the Annelid jaws described by him are imbedded. A description 

 was given of the principal varieties of form and of the structure of 

 the jaws. They were classified from their resemblances to existing 

 forms under seven genera, five of which are included in the family 

 Eunicea, one in the family Lycoridea, and one among the Glycerea. 

 The author enumerated fifty-five different forms, the greater pro- 

 portion of which are from the Cincinnati group. 



