386 Canadian Record of Sctence. 
Protospongia (?) cf. major Hicks and another large species, 
whose branches or cups were ten inches or more in length. 
These large sponges must have lived in quite shallow water, 
as they are found bedded between ripple marked sandy 
layers. 
Many of the beds of this division abound with the tracks, 
burrows and casts of worms, among which are a Mono- 
craterion, whose straight ray-like tracks spread from the 
burrow, a distance of eight or ten inches. Two species of 
Arenicolites are common, one quite small, another larger 
with a space of one to one and a half inches between the 
burrows. The cast of the gallery of this species, seen from 
below, greatly resembles Mr. Billings Arthraria, as the 
gallery is enlarged a little at each extremity; and short 
examples thus look somewhat like dumb-bells. 
Among fossils which appear to have their place in the 
upper part of Division 2, are some that have been found in 
the Kennebecasis basin of Cambrian rocks. These are Lep- 
toplasti one allied to L. stenotus, Ang. Agnostus pisiformis, 
var. and Agnostus Nathorsti, var. The association of these 
trilobites would indicate a horizon at the top of this divi- 
sion. 
Fauna of Division (Stage) 3.—(Peltura Beds). 
The species which indicate this horizon are two species 
of C. tenopyge (cf. C. flagillifer and C. spectabilis,) Orthis 
lenticularis and a Kutorgina, these occur in the middle of this 
division. At the bottom of the division Lingulella lepis is 
found, and another larger species (i. ampla, var ?) 
Beds in Cape Breton corresponding to this stage, have 
Peltura scarabeoides, Spherophthalmus alatus, and Orthis 
lenticularis. 
Fauna of Arenig Group (Ordovician). 
This horizon is indicated by certain fossils lately discover- 
ed in the St. John basin, at the summit of the Cambrian 
measures. 
