Editorial Covimenf. 17*^ 
The greatest thickness exposed on the beach is from ten to twelve 
feet, but the side of the hill facing the west, which was about seventy 
feet or upwards over the level of the lake, is chiefly of sandstone, some 
of which may be additional strata. Large angular masses of fossiliferous 
limestone are strewn over the beach, having Ijeen removed appaiently 
no great distance from their parent beds. They probably occupy a 
jjortion of the bottom of the lake. The character of the fossils in these 
masses appeared to be of the Chazy age." — Murray. 
Ormoceras teimljiiicus Hall. Separated fragment of siphunclc ;ind 
section with septa; ill preserved. 
Escharoj)ora subrecta Ulr. 
Helopora mucronata Ulr. (Stones River group species). 
Eficharopora ? limitaris Ulr. 
Rhinidicii/a. mutabilis var. major Ulr. 
PJii/Uodictya i-aria Ulr. 
Batostoma icinchelli Ulr. 
CaUopora viultitahulata Ulr. 
Columns of an undetermined Glyittorriuns. 
Bhynchotrema ina'quwalvin Castenau. 
Leperditia fabulitea Con ? 
Aparchites neglectua Ulr. 
These species indicate exact equivalence with the Black 
River group of shales at Minneapolis, as discussed and de- 
fined in Vol. Ill, Fart 2. of the forthcoming report of the 
Minnesota survey. They sliow the ])robable former preva- 
lence of the Trenton ocean far to the north and taken in con- 
nection with the small known area of the Trenton in northern 
Michigan, near the base of Keweenaw point, indicate that in 
the Trenton age a continuous sea occupied the area from lake- 
Nipissing to lake Winnipeg. 
EDITORIAL COMMENT. 
The Missing Link. 
The gap which separates man from the ape is similar to 
and perhaps no greater than other gaps existing betwen ex- 
tinct forms of animal life which have been bridged by the 
easy assumption of specific variation and direct generic de- 
scent, without doing violence to the theory of evolution by 
natural selection. But between the a])e ami man there is a 
chasm, other than morphological, which presents a barrier 
against the operation of the law of evolution, and which it 
seems to b(^ necessary to fill by more gradual ste|)s i)efor(' the 
