OF CAPE BRETON AND NEWFOUNDLAND. 149 
similar stratigraphical position in the Cambrian system of Europe. We are therefore 
without sufficiently definite knowledge to fix absolutely the horizon of these limestone 
beds, by the contained fossils. 
B.— Horizon of the CONOCORYPHIN &.—In entering upon the discussion of this horizon, 
we stand upon more stable ground. The range of the genera, Conocoryphe and Ctenocephalus, 
in Scandinavia as in Acadia is well understood, and therefore, in the presence of these 
forms at Manuel River, near Topsail Head, we have, by their known vertical distribution, 
which is limited, a means of deciding, within certain fixed bounds, the age of the shales 
which contain them. 
Mr. Whiteaves records from Manuel River the following species :— 
Microdiscus punctatus, Salt. 
M. Dawsoni, Hartt. 
Agnostus Acadicus, Hartt. 
Conocephalites (Liostracus ?) tener, Hartt. 
C. (Conocoryphe) Baileyi, Hartt. 
C. (Ptychoparia) Orestes, Hartt. 
Of these species, the second, fourth and fifth do not range as high in the Cambrian 
rocks of the St. John basin (in New Brunswick) as the others; the assemblage may be 
regarded as corresponding to Band ¢ of Division 1, of the St. John group. In the material 
sent to me by Mr. Howley from this locality, the following additional forms were found : 
Paradoxides, Sp. 
Agnostus gibbus (?), Linrs. 
Agraulos socialis, Bill. 
Hyolithes, Sp. 
From the examples in this collection, it appears that Agraulos socialis, Bill., was much 
like Arionellus difformis, Ang., and had similar spines on the occipital ring and on certain 
segments of the thorax; but it differed from that species in the form of the glabella, which 
is conical. It appears to combine characters found in A. difformis and A. ceticephalus, Barr. 
C.—Horizon of PARADOXIDES SPINOSUS (?)—I quote this species on account of the 
occurrence of Paradoxides Bennettii, Salt., at Branch, on the promontory between St. Mary’s 
Bay and Placentia Bay. This species (P. Bennettii), discovered many years ago, was the 
first which drew attention to the interesting Primordial fauna of Newfoundland. The 
resemblance of this species to P. Harlani, Green, from Braintree, Massachusetts, has been 
pointed out by Prof. C. D. Walcott and others. I do not know what species are associated 
with this Newfoundland trilobite, but Mr. Billings has described, from the locality referred 
to above, Agraulos affinis. An Agraulos and a Ptychoparia have also been described from 
the Braintree locality, but as the species have not been recognized elsewhere, and the 
genera have a considerable range, we do not get much help from them towards fixing 
_ the exact horizon of P. Bennettit.' 

1 Since writing the above, a very large Paradoxides has been found in Band ¢ of Division 1 of the St. Jobn 
group, which is related to this species by the great width of the body, short genal spines, foliaceous pleuræ, etc. ; it 
also has points of resemblance to P. Harlani and P. Forchammeri, If P. Bennettii holds the same stratigraphical 
position as the large species of the Acadian Cambrian rocks, it will be in close relation to the horizon of the 
Conocoryphinæ. 
