Classification of Cambrian Rocks 305 
Ellipsocephalus, both recalling forms which, in Europe, are 
associated with Olenellus (?) Kjerulji. 
In the most northerly basin of Cambrian Rocks, in the 
southern part of this Province, (New Brunswick), the 
writer, during the past summer, collected an Obolus near 
the base of Band b., which may serve to link the fauna of 
this band with that of the Fucoid Sandstone, in Sweden, 
The shell in question is remarkable for the change in form 
which it underwent during growth, and for a peculiar radu- 
lar ornamentation. 
This variety of sculpture is not infrequent in the brachio- 
pods, which are found in company with the Olenelloid trilo- 
bites. Such a form is known in the Fucoidal Sandstone, 
under the name of Lingula (?) favosa Linrs. Another simi- 
lar one is Lingulella celata, Hall, and a third is Kutorgina 
pannula, White, of the Olenellus fauna of Nevada. 
. Dr. Hicks also figures and describes an organism from 
the Caerfai Group in Wales, as a doubtful Leperditia (L.? 
Cambrensis) which may be a brachiopod with cancellated 
ornamentation, it is represented as of oval or semi-circular 
form, and is said to show a “reticulate ornamentation. * 
Possibly this, which is found in sandy beds with Ligulella, 
may alse be a brachiopod, with radular sculpture, but on 
the other hand it may be a fragment of a Olenelloid trilo- 
bite, as in this sub-family the surface has reticulate orna- 
mentation. 
Kutorgina pannula is a similar, but smaller form, in 
which the cancellation is raised as in some examples of 
our Obolus ; and the possible outgrowths of the latter form 
may be seen by comparing its embryonic shell with Kutor- 
gna pannula. 
The following are the characters of the Obolus referred to 
above :— 
’ Quart. Jour. Geol. Soc., London, 1871, Vol. 27, p. 401. 
