406 
The American Geolocjist. 
June. 1897 
Theoretical vieio of the supposed relation of the OlenelUd Faunas and 
the Protolenus Fauna to Paradoxides. 
Canada. Scotland. 
U. States. U. States. Newf'ndl'd 
Scotland. Sweden, England. 
Kussia. 
6. 
A. Isevigatus. 
X 
H 
.5. 
P.forchliammori 

a 
< 
4. 
;«. 
2. 
P. davidis. 
V. tessini. 
P. rugulosus. 
1. 
P. oelandicus' 
Olenellus 
gilberti. 
Olenellus Mesonacis 
tliompsoni. vermontana 
1 Ellipto- 
• cephala 
• asaphoides 
Protolenus tOleuellus 
I tOleuoides lapworthi, 
: etc. 
Holmia 
kjerulfi. 
Paradoxidean 
phylum. 
Olenellid 
phylum. 
O. (Calla- 
via) 
brOggeri. 
I 
O. (Calla- 
via,) 
callavii. 
II 
and Hicks after their study of the Welsh Cambrians, and it is 
equally applicable to those of eastern Canada. A glance at 
the preceding table will show how difficult it is to draw the 
line which shall separate the Olenellus from the Paradoxides 
fauna on this side of the Atlantic, whatever may be the con- 
ditions in Europe, or the exigencies of classification in west- 
ern America. 
Postscript. — ^I tind that I can say something more definite 
about the place of the Olenellus fauna. 
In the last few days I have been examining the material of 
a new sub-fauna of the Paradoxides beds of the St. John 
group. It is from irregular layers of limestone in the Kenne- 
becasis valley, and besides a paradoxidean form of which the 
-\Olenoides and Olenellus lapworthi, though placed in this table 
below the Paradoxides beds, are not actually known to hold this rela- 
tion, they may be higher up in the Cambi-ian system than they are here 
represented to be. 
JThe divisions of the Paradoxides beds given hete are those of the 
north of Europe. 
