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Scanning electron microscope photographs of a boring in a six-sided variant of D. (Dentalium) laqueatum Verrill, USNM 780591d. Album caption and Professional paper 1282, plate 2 caption: Figures 1-6. Scanning electron microscope photographs of a boring in a six-sided variant of D. (Dentalium) laqueatum Verrill, USNM 780591d. 1. Vertical view of "half hole" specimen, broken at the point of drilling. x 60. 2. Vertical view of the boring, showing the fine reticulate surface ornament extending to the margin of the boring without any etched zone. x 150. 3. Enlargement of the upper surface seen in figure 2, showing the relationship of crosslamellar structure to the ornament and emphasizing the lack of an etched zone. x 270. 4. Slightly oblique view, showing the steep but gently concave curved wall of the boring. x 150. 5. Detail at the inner... Categories: Image; Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: Louisiana, Photographers, Yochelson, E. L. Collection, photo print Broken and repaired shells and apertural views of D. (Dentalium) laqueatum Verrill. Album caption and Professional paper 1282, plate 3 caption: Figures 1-6. Broken and repaired shells and apertural views of D. (Dentalium) laqueatum Verrill. 1. A "half hole" between two ribs of a seven-sided variant. x 15, USNM 780591e. 2. Apertural view of a seven-sided variant broken at the apex; compare with the thickened ribs shown in figure 1. x 15, USNM 780591f. 3. Apertural view of a large seven-sided variant with reduced ribs, 4.9 em in chord length. x 15, USNM 780591g. 4. Left-side view of a seven-sided variant, with a single break, 3. 7 em in chord length. x 5, USNM 780591h. 5. Right-side view of seven-sided variant with two breaks, 3.2 em in chord length. x 5, USNM 780591i. 6. Slightly oblique ventral... Categories: Image; Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: Louisiana, Photographers, Yochelson, E. L. Collection, photo print General views of Dentalium (Dentalium). Louisiana. Late Cretaceous geological period. Album caption and Professional paper 1282, plate 1 caption: Figures 1-4. General views of D. (Dentalium). 1. Dorsal-side view of a seven-sided variant of D. (Dentalium) laqueatum Verrill, 4.5 em in chord length; the borehole has a maximum length of 4.9 mm. x 5, USNM 780591a. 2. Left-side view of a six-sided variant, D. (Dentalium) laqueatum Verrill, that has a seventh intercalated rib, shown to the left appearing some distance below the broken apical area. x 5, USNM 780591b. 3. Left-side view of D. (Dentalium) obscurum Dall, a nine-sided variant, 3.1 em in chord length; the borehole has a maximum length of 5.8 mm. x 5, USNM 780952a. 4. Part of a six-sided variant, D. (Dentalium) laqueatum, 4.5 em in chord length,... Categories: Image; Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: Louisiana, Photographers, Yochelson, E. L. Collection, photo print Ontogenetic change in the apex of D. (Dentalium) laqueatum Verrill. All specimens x 15. Album caption and Professional paper 1282, plate 4 caption: Figures 1-3. Ontogenetic change in the apex of D. (Dentalium) laqueatum Verrill. All specimens x 15. 1. A small keyhole in a seven-sided variant, 3.6 em in chord length; USNM 780591k. 2. A V -shaped reentrant in a six-sided variant, 5.1 em in chord length; USNM 7805911. 3. A prominent slit in a six-sided variant, 5.3 em in chord length; USNM 780591m. Categories: Image; Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: Louisiana, Photographers, Yochelson, E. L. Collection, photo print Ontogenetic change in the apex of D. (Dentalium) laqueatum Verrill. All specimens x 15. Album caption and Professional paper 1282, plate 4 caption: Figures 1-3. Ontogenetic change in the apex of D. (Dentalium) laqueatum Verrill. All specimens x 15. 1. A small keyhole in a seven-sided variant, 3.6 em in chord length; USNM 780591k. 2. A V -shaped reentrant in a six-sided variant, 5.1 em in chord length; USNM 7805911. 3. A prominent slit in a six-sided variant, 5.3 em in chord length; USNM 780591m. Categories: Image; Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: Louisiana, Photographers, Yochelson, E. L. Collection, photo print