*^ $02 Point Levi Fossils, 



. 1 



The following list gives the total uumber of species discovered 

 in the several limestones above designated at this locality up to 

 the present date. 



No. 1 21 species. 



2 41 



3 2 



4 2 



66 



Deduct common to 1 and 2 2 



Total 64. 



The formation of slate and shale in which these limestones are 

 imbedded, contains as I am informed, about thirty species of grap- 

 tolites and other allied fossils ; and besides these, two species of 

 Lingula^ an Orthis, sl Discina, and a minute trilobite which will 

 probably constitute a new genus. 



The slates and limestones, according to the above, hold about 100 

 species, and it is more than probable that this number will be 

 much increased by future discoveries. 



In this paper I shall notice only the trilobites found in the lime- 

 stones. 



The other fossils appear to be nearly all new species and must 

 remain over for another paper. 



All the specimens described in this article were found in the con- 

 glomerate limestones near Point Levi opposite Quebec, and to 

 save space I shall not repeat the locality after each description. 

 It is not yet decided whether the fossils occur in the boulders of 

 the conglomerate or in matrix. 



Agnostus Americanus. N. s. 

 Fig. I.— a. b. 



Description. — Head oblong semi-oval, rather strongly convex, 

 most elevated at the posterior one-fourth of the length, thence de- 

 scending with a depressed convex slope in all directions to the sides 

 and front ; margin with a very narrow projecting border. The 

 glabella is elongate oval ; width, one-third that of the whole 

 head ; length, rather more than two-thirds the length of the head. 

 It has two transverse furrows which completely or partially divide 

 it into three segments. The anterior furrow extends all across at 



