372 Canadian Record of Science. 
continent, has been omitted, and the brace which takes its 
place is misleading. The Olenelius-Bathyuriscus fauna 
should also be connected with No. 2, Middle Cambrian, 
rather than with No. 1, Lower Cambrian. 
Other changes that should be made in the article are the 
following :— 
Page 310, line 24, omit System. 
In the table on page 313, as well as in the text on the 
same page, for Agnostus intercinctus read Agnostus interstrictus, 
Page 314, line 8, after list, insert (Bathyuriscus and Asa- 
phiscus. 
Page 314, line 24, after great, insert vertical. 
In the first article of this series (see Vol. III., No. 1, this 
journal), certain worm-tracks and casts are referred to as 
being plentiful in the Basal or Etcheminian series. But far 
more abundant and generally distributed than these are the 
remains of sponges. The gleaming reflections from their 
skeletons are common on the surfaces of the finer shales, 
and their spicule are very generally distributed in coarse 
deposits as well as fine. 
Sponges are found in the first beds above the lowest cong- 
lomerate, a horizon which is about sixty feet from the base 
of the terrein, and about fifteen hundred feet below the 
Paradoxides beds. At various horizons in the Basal series 
have been found different kinds of sponges: some of the 
basket-sponge group; others of the ordinary silicious 
kinds. The latter present several varieties of form, some 
are tubular, others-branching with a solid axis, and others 
again are amorphous with numerous orifices (cloaca) of ir- 
regular form. 
Even the sandstones are replete with the debris of sponges, 
both silicious granules and fragments of the sponge cuticle 
and of spicule are plentiful among the sand grains, of which 
these beds are composed. So we may see that sponges have 
played an important part in the building up of sedimentary 
deposits at the very dawn of Palzozoic Time. 
