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Ethnology of Manihiki and Rakahanga
Figure 54. Adzes of Tridacna shell. a, adz in B. P. Bishop Museum (C. 2767): shell about 8 mm. thick but thinner in places owing to natural grooving of outer surface; outer surface of shell forms front, ground down in places to remove natural roughness; lower cutting edge fairly straight but curved up slightly at one end; shell fairly straight; bevel to form cutting edge, on front. b, adz in B. P. Bishop Museum (C.2768): outer surface of shell forms front; shell curved, front distinctly convex longitudinally and transversely; lower cutting edge convex; bevel grinding on back; thickness, 5 mm
Figure 54. Adzes of Tridacna shell. a, adz in B. P. Bishop Museum (C. 2767): shell about 8 mm. thick but thinner in places owing to natural grooving of outer surface; outer surface of shell forms front, ground down in places to remove natural roughness; lower cutting edge fairly straight but curved up slightly at one end; shell fairly straight; bevel to form cutting edge, on front. b, adz in B. P. Bishop Museum (C.2768): outer surface of shell forms front; shell curved, front distinctly convex longitudinally and transversely; lower cutting edge convex; bevel grinding on back; thickness, 5 mm.
