Book Excerpt Entitled, "Lituites Undatus"

Hall, Geol Rep. Wis. 1861 p 38

GENUS LITUITES, BREYN.

AR

LITUITES UNDATUS, VON OCCIDENTALIS, (n. s.)

In the "Buff limestone," of Wisconsin, there occurs a
large Lituites, which has usually been referred to the
Lituites undatas of the Black River limestone of New York.
On comparing specimens of the two together, I find several
important differences, which could scarcely be expected to
happen in so well marked a species as the L. undata, as it oc-
curs in the New York rocks. In specimens of about the same
size, the volution of the Western one are much wider in pro-
portion from the ventral to the dorsal side, they are more flat-
tened on the sides and the back is squarely truncated; the
New York specimens being rounded on the sides and moder-
ately flattened on the back. The volutions in the latter have
apparently a greater proportional lateral diameter, and the
septa are more distant.

In consideration of these differences, I have proposed to in-
dicate it as a distinct variety, which hereafter may prove to be
specifically distinct.

Geological Formation and Locality. In the lower part of the
"Buff limestone," at Beloit and elsewhere, in Wisconsin.

= Nautillus [Nautilus] occidenlalis [occidentalis] Hall in
Req. Rep 20 p. 363

Lituites cancellatum McChesney p. 96

Niagara Group

Babel Mine near Warren Ill.

June 1873!

Beloit!

Hall, Geol Rep. Wis. 1861 p 38

GENUS LITUITES, BREYN.

AR

LITUITES UNDATUS, VON OCCIDENTALIS, (n. s.)

In the "Buff limestone," of Wisconsin, there occurs a
large Lituites, which has usually been referred to the
Lituites undatas of the Black River limestone of New York.
On comparing specimens of the two together, I find several
important differences, which could scarcely be expected to
happen in so well marked a species as the L. undata, as it oc-
curs in the New York rocks. In specimens of about the same
size, the volution of the Western one are much wider in pro-
portion from the ventral to the dorsal side, they are more flat-
tened on the sides and the back is squarely truncated; the
New York specimens being rounded on the sides and moder-
ately flattened on the back. The volutions in the latter have
apparently a greater proportional lateral diameter, and the
septa are more distant.

In consideration of these differences, I have proposed to in-
dicate it as a distinct variety, which hereafter may prove to be
specifically distinct.

Geological Formation and Locality. In the lower part of the
"Buff limestone," at Beloit and elsewhere, in Wisconsin.

= Nautillus [Nautilus] occidenlalis [occidentalis] Hall in
Req. Rep 20 p. 363

Lituites cancellatum McChesney p. 96

Niagara Group

Babel Mine near Warren Ill.

June 1873!

Beloit!