Their teeth are curved, but not angled. The conceptual design calls for a slender cone with convex, gently curved sides. The sharp edges of a sword may be either curved or straight. The jaw angle is curved and indistinct. Lenses derive their power from curved surfaces. It usually is inside a display case with three curved legs. Its sturdy tusks are curved out and point forward. The fuselage was continuously curved with no straight lines. The Roman mandolin had a fingerboard that was more curved and narrow. The needle can be curved or straight. Lower jawbone is moderately curved from front to back. In contrast to nails, claws are typically curved ventrally (downwards in animals) and compressed sideways. The bacteria are curved or straight rods. The beak is long, slightly curved and hooked. The waist stripes are now curved instead of being straight across.