Box 25, Folder 6: Paleontology II

Orthis Barabuensis Winchell

Am Jour (2) 37 p 228 -

Potsdam Sandstone

N.E corner of Devil's Lake near Baraboo

Orthis bellarugosa Conrad,

Proc. Acad Nat Sc Pha. 1843 p 333 - Hall

Pal. N.Y. 1 p 118

Hall - Wis Geol Rep 1 p 42 figs 415 & & p. 435

Trenton Limestone

Orthis biforata Schlotheim

(See next page)

Hall Geol Wis 1 p 54 figs 3 + 4 + p 435

Ohio Report Vol 1 p 112 pl. 10 -

Mineral Point

} Upper layers of

Near Shullsburg &c Galena Limestone

Has numerous varieties

O. biforata var Lynx Ohio Rep 1 p 114

var. laticosta " " 116

dentata 117

acutilirata 119

Orthis biforata, Schlotheim

Spirifer lynx, Eichw. Russ. Geol.

Delthyris lynx, Von Buch.

Delthyris biforatus var= lynx,

Hall. Pal. of N.Y. Vol. 1 p. 133 pl. 32 D. fig 1.; & vol 2 p 65 pl 22 fig 1 Delthyris brachynota, Hall N.Y. Geol. Rep p 71 fig 6.

Shell scarcely transverse, varying from semielliptical to subquadrate + globose, often nearly as thick as long ; length and width as 5 to 9, or equal; cardinal line often extending exceeding the width of the shell, and usually extending into short acute ears, or rounded at the extremities; area common to both valves, as also the foramen; ventral value more gibbous than the dorsal valve; surface marked with strong angulated longitudinal plits, plaits, about three or four of which make the sinus, and four or five the elevated mesial lobe; transversely ornamented by concentric or flexuous elevated subimbricating lines which are very obvious on the lower half of the

of the shell, becoming very distinct in front, and in perfect specimens continuing nearly to the beak. - Examined with a magnifier, the surface is seen to be covered with a very fine granulations.

L. 0.6 to 1.5-H. 0.5 to 1.1-D 0.4 to 1.3

Lower^& middle Silurian - Trenton Limestone & clinton Group

Middleville, Trenton Falls, Herkimer, Jacksonburgh Turin, & Watertown, ^Rochester, & Raynale's basin N. York. - Maysville ^& Frankfort & Louisville Ky. Cincinnati, Lebanon + Oxford, & Springfield Ohio. Madison Indiana, Mineral Point, Menasha, & Green Bay, Wisconsin.

Near Nashville Tenn.

Drummonds island, L Huron

Jefferson + Bullet Counties Ky

Penna

Also found in Europe.