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Spirifer crispus, Hisinger; Hall, [James Hall Jr. (September 12, 1811 – August 7, 1898) was an American geologist and paleontologist]
Pal. of N.Y. Vol 2 p 262, pl. 54 fig. 3; Delthyris ["Delthyris" is underlined]
Straminea ["Straminea" is underlined], Hall N.Y. Geol. Rep. p. 105 fig. 3.

Shell subrhom boidal [ventral valve
semicircular), gibbous; valves very unequal,
the dorsal one extremely conves, and the
beak extended and incurved; surface
marked by five or six, rarely eight, plica =
tions on each valve, which are sometimes
obsolete, concontrically marked by fine
elevated thread like striae; area broad,
with the cardinal extremities short;
formaen long, narrow.

L. 0.5 H. 0.4 D. 0.3