. Bulletins of American paleontology. ii 0f m^ rl Wj Wki \ V -I^v^-^ D 1 Text-figure 66.—Pelecypods with shell surfaces bearing spii cnt. A-C. Piiutiula imh, SURFACE WITH SPINOSE ORNAMENT Pinctada iinhrkalaText-figure 66A-C AMOCO Taxon #.—2165 Diagnosis.—Fragile, nacreous shells, to 25 mm longat the hinge. Internally, there is a strong vertical ridgebelow the umbo. Intact shells bear rows of flat radialspines (Text-fig. 66A), but because of their fragilitythe usual specimen is smooth (Text-fig. 66B, C). Remarks.—Of the many hundreds of these shellsfound in our samples, the specimen shown in Te
. Bulletins of American paleontology. ii 0f m^ rl Wj Wki \ V -I^v^-^ D 1 Text-figure 66.—Pelecypods with shell surfaces bearing spii cnt. A-C. Piiutiula imh, SURFACE WITH SPINOSE ORNAMENT Pinctada iinhrkalaText-figure 66A-C AMOCO Taxon #.—2165 Diagnosis.—Fragile, nacreous shells, to 25 mm longat the hinge. Internally, there is a strong vertical ridgebelow the umbo. Intact shells bear rows of flat radialspines (Text-fig. 66A), but because of their fragilitythe usual specimen is smooth (Text-fig. 66B, C). Remarks.—Of the many hundreds of these shellsfound in our samples, the specimen shown in Text-figure 66A was the only one that retained a significantnumber of the radial spines. An oblique smooth shell,a prominent anterior ear in front of the umbo, anda vertical ridge below the umbo inside are the distin-guishing features. Because of its fragility this shell breaks readily intomany small pieces. Samples collected from sediments
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Keywords: ., bookcentury1800, bookdecade1890, bookidbulletinsofa, bookyear1895
