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[blue ruled paper; handwritten page, verso, visible]

Spirifer hemiplicata Hall.
[James Hall Jr. (September 12, 1811 – August 7, 1898) was an American geologist and paleontologist.]
(Stansbury's Great Salt Lake Report p.409, pl. 4, fig. 3.)

Shell gibbus ; ventral valve more elevated;
beaks nearly equal; entire surface marked by
finely radiating striae; each valve with
about three plications on each side of the
mesial sinus and elevation, which plications
extend half the way from the base to the beak,
leaving the upper half of the shell marked
only by fine striae; anterior portion of
the dorsal valve produced in a long
extension, which fills a deep angular
sinus in the ventral valve.

L. 0.7 - H. 0.7 - D. 0.8