p. 1

[blue ruled paper; worn embossing at u.l.: SUPERFINE LAID PAPER [scrolling banner surrounding text]; handwritten page, verso, visible]

Orthis flabellum,? Sowerly; Hall [James Hall Jr. (September 12, 1811 – August 7, 1898) was an American geologist and paleontologist. He was a noted authority on stratigraphy and had an influential role in the development of paleontology in the United States.]
N.Y. Geol. Rep p 105 fig 5; Pal. of N.Y.
Vol. 2 p. 254 pl. 52 fig. 6

Shell semioval; hinge=line equal
to the width of the shell; surface marked
by twenty four to thirty simple rounded
plications, which are equal to the space
between them; plications usually smooth,
with the remains of concentric striae
crossing the depressions between, and
rarely appearing on the elevations; a few
strong imbricating lines of growth
near the base; cardinal area usually
narrow + extending to the extremity
of the hinge=line. - Foramen broadly
triangular with a thin sharp tooth in the
centre, & a stronger one on each side projecting
into the centre.

L. 0.95 H 0.7 D 0.2