492 



II. M. AMI — THE GEOLOGY OP QUEBEC. 



strata occurring there. The lists of species and descriptions of the beds are 

 given in the "Second report on the geology of a portion of the province of 

 Quebec," which Mr. Walcott has recently reviewed in the American Journal 

 of Science. 



The probably Calciferous age of these strata, termed Levis, has been proven 

 by Mr. Billings on paleontological evidence. The abundance of graptolites 

 and of certain well-marked zones of these in different portions of the series 

 of Levis strata, along with the recurrence of the congh)merate bands care- 

 fully mapped by Sir William Logan, enable the geologist to trace out the 

 foldings and recurrence of strata at different points. The occurrence of 

 large cephalopods in pebbles of the conglomerate, besides the Cambrian 

 forms which many of these hold, is a point worthy of closer scrutiny. 



The following is a list of species collected by Dr. Ells, Mr. Giroux and 

 the writer at Levis, all obtained from definitely located places : 



GRAPTOLITID.E. 



Nemagraptus capillar is (?) ; 



" sp. und. ; 



Didymograptus bifidus; 



" constr ictus ; 



" extensus; 



" furcillatus ; 



*' pennatulus ; 



" sp. und. ; 



Tetragraptus approximatus ; 



" cadiiceus, Salter 



(= T. bigsbyi, Hall); 



" denticulatiis ; 



•' fniticosus; 



" headi; 



" hicksi; 



" quadribrachiatus ; 



" serra 



(= T. bryonoides) ; 

 Dichograptus octobrachiatus ; 



" richardsoni; 



" ramulus; 



Lingida quebecensis ; 



" irene ; 



" sp. nov. ; 



" sp. und. ; 

 Elkania desiderata ; 



Loganograptus logani ; 

 Clonograptus rigidus ; 

 " flexilis ; 



" sp. und.; 



Goniograptns thureaui 

 var. selwyni ; 

 Diplograptus dentatus, Bgt. 



(= D.pristiniformis, H.) ; 

 Diplograptus (?) trlcornis; 

 Phyllograptus anna; 



" ang ustif alius ; 



" typus ; 



Trigone graptus e^isiformis; 

 Ptilograptus plumosus ; 

 Dictyograptus irregularis ; 

 " sp. nov. 



(= D. delicutula, Dawson) ; 

 " sp. (cf. D. homjrayi) ; 



" sp. und. ; 



ERACHIOPODA. 



Leptobolus (?), sp. und. 

 Linnarssonia, sp. und. ; 

 Siphonotreta (?) micula; 

 Orthis, sp. und. ; 

 Shumardia gran ulosa. 



