314 E, Billings on some of the 



the posterior margin. The side lobes of the pygidium are without 

 ribs, but a deep rounded groove runs all round at one line from 

 the margin. 



This pygidium was first discovered by Mr. Hunt at Point Levi 

 and for several years was the only fossil known to us in the lime- 

 stones of that locality. Afterwards the late John Head, Esq., 

 and Sir W. E. Logan found other specimens of it at the same 

 locality. This led to further researches, and at length Mr. 

 Richardson and Mr. Bell discovered the rich fauna which has 

 given us a clue to the Geological age of the Quebec group. At 

 Point Levi B. Saffordi is the most abundant and characteristic 

 fossil of the Limestohe which I have designated. No. 2, in the 

 paper above cited. It is common at Phillipsburgh, but not so 

 abundant as at Point Levi. 



B. Cordai. — Of this species I found one specimen on Lot No. 1 

 of the Township of St. Armand, in the hill west of the road to 

 Phillipsburgh, close to the Province line. On comparing this 

 species with B. conicus from the Calciferous sandrock at St. Timo- 

 thy, I am strongly inclined to consider them identical, the only 

 difference being that the surface of the latter is tubercled and of 

 the former smooth. 



Menocephalus glohosus ? Two ill -preserved glabellas were found 

 which resemble this species. 



On comparing the whole collection of the Phillipsburgh fossils 

 with those at Point Levi, the general aspect is the same, and I be- 

 lieve that at least one half of the species are common to the two 

 localities, but owing to their state of preservation much further 

 examination will be required to decide this question with certainty. 



In the following table I shall designate the rock in which the 

 Dikellocephalus, &c., occurs at Point Levi No. I, and include all 

 the others of that locality under No. 2. The Phillipsburgh rocks 

 I shall also divide into two groups ; the magnesian limestones No. 

 1, and the upper blue limestones No. 2. In this arrangement I 

 wish it to be understood that although I consider No. 2 of Phil- 

 lipsburgh as the equivalent of No. 2 at Point Levi, yet the groups 

 No. 1 of the two localities I do not identify. It is possible that 

 they may be the same, but the question cannot be decided with 

 certainty without fossils : — 



