. Atoll research bulletin. Coral reefs and islands; Marine biology; Marine sciences. 27 publications or in the Aide Museum (National Museum of the Marshall Islands) collec- tions. Inspection of whole and fragmentary reference shells shows clearly that the whorls of Cassis cornuta are much thinner with an uneven surface. Five of seven (71%) specimens were made from the whorl of Cyraecassis rufa shells at least 138 mm long (Fig. 16c and d). Grinding is minimal on the back and sides and is not required on the front surface. All specimens are concave-convex in cross-section with curved to slightly
. Atoll research bulletin. Coral reefs and islands; Marine biology; Marine sciences. 27 publications or in the Aide Museum (National Museum of the Marshall Islands) collec- tions. Inspection of whole and fragmentary reference shells shows clearly that the whorls of Cassis cornuta are much thinner with an uneven surface. Five of seven (71%) specimens were made from the whorl of Cyraecassis rufa shells at least 138 mm long (Fig. 16c and d). Grinding is minimal on the back and sides and is not required on the front surface. All specimens are concave-convex in cross-section with curved to slightly curved, flat cutting edges at an angle of 40-55° (see Tables 2 and 3). These specimens are type 10 of Kirch and Yen (1982). Two adzes made from the lip region are both plano-convex in cross-section and are classified as type 9. Grinding is minimal (Fig. 16a) to 100% (Fig. 16b) The cutting edges are curved and flat or concave. Abraders These artifacts were used for shaping and smoothing relatively soft material—such as thin shells (, Conus sp. and Pinctada sp.), wood, and bone—into tools and ornaments. A single Acropora sp. branch coral abrader has a rounded and smooth surface that would be ideal for shaping the interior bend of pearlshell fishhooks. It measures mm long and. FIGURE 16. Adzes made from the lip region (a and b) and body whorl (c and d) of Cypraecassis Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Smithsonian Institution. Press; National Research Council (U. S. ). Pacific Science Board; Smithsonian Institution; National Museum of Natural History (U. S. ); United States. Bureau of Sport Fisheries and Wildlife. Washington, D. C. : [Smithsonian Press]
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