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Cambrian Organisms. 385 
ORGANISMS OF THE St. JOHN OR ACADIAN GROUP (SERIES), 
Fauna and Flora of Division (Stage) 1,—(Paradoxides Beds). 
The fauna of Band } of this stage, resembles in many re- 
spects that of the series just described. There is the same 
prevalence of sponges. The basket sponges and the rod- 
like sponges (?) are common to both, but the latter here 
attain a much larger size, and are more plentiful. In all 
the fine layers of this band, traces of Protospongiade may 
be found, but no examples of the typical Protospongias of 
the Paradoxides beds have been observed. The Protos- 
pongiade of this band have either a minute rectangular 
reticulation, or the mesh is coarser, and crossed by large 
diagonal and branching spicules. Even the sandstone beds 
of this band exhibit numerous fragments of spicules. 
The brachiopods are represented in this band by several 
genera, some of which have been already described. This 
paper contains descriptions of additional species—an Obolus, 
a Lingulella, and three species of Leperditia. 
The Algze are present in several different types, among 
which are a Buthotrephis, and a microscopic form parasitic 
on the larger organisms. This little thing spread itself in 
a minute network over the mud of the sea bottom, by 
jointed filaments, which at their intersection formed en- 
larged nodes. There are also some quite small oval forms of 
dark color resembling Hydrocystium, which may have 
been algoid. 
Among the new species of the Paradoxides beds is a 
little Platyceras. New facts have been obtained, relative 
to the smaller Stenotheca, to Lepidella anomala and to two 
species of the Paradoxides that have been described: 
P. pontificalis is found to be a narrow, and P. Micmac 
a broad form of P. Hicksii. 
Fauna of Division (Stage) 2.—(Olenus Beds). 
Abundant remains of large Protospongia are found in 
these beds, Among them are Protospongia fenestrata, Salt, 
