Scanning electron microscope photographs of a boring in a six-sided variant of D. (Dentalium) laqueatum Verrill, USNM 780591d.
Summary
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 margin of the boring. [...]
Summary
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 margin of the boring. x 400. 6. Detail of shell structure of the fracture surface at the juncture of outer and inner shell layers shown in figure 4. x 1000.
Available in the U.S. Geological Survey Denver Library Photographic Collection Yochelson, E.L. Collection.
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