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Spinaptychus sternbergi, n. sp., from the Niobrara formation of Logan and Gove Counties, Kansas.
A, Paratype (Mus. no. 2683). Inner view of harmonic margin of left valve showing the nature of the
harmonic flange (X 0.75).
B, Holotype (Mus. no. 2022). Outer view (X 0.45).
C, Paratype (Mus. no. 2906). Projection print of transverse thin section of mature region, cut
normal to growth lines, showing microstructure of shell. Tone of print is reversed. Arrow points to
ventrolateral margin (X 8.25).
D, Holotype (Mus. no. 2022). Enlarged portion of mature region of right valve near lateral margin
A Spiny Aptychus from the Cretaceous of Kansas, by Alfred G. Fischer and Robert O. Fay
Originally published June 1953 as Kansas Geological Survey Bulletin 102, Part 2.
Available online at http://www.kgs.ku.edu/Publications/Bulletins/102_2/index.html
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