Standard order of echo signals in echo patterns along the time axis is B-L-LT-T; amplitudes of these signals depend on lens position with respect to the specimen face. Usually, it is seen in echo patterns B and L signal only, and then, for remarkable lens displacement toward the object face, it is possible to see LT and T signals. So occurrence of concave regions on the transverse wave slowness surface changes the order of echo signal arising – we observe B and LT signals first, and only then the L and T echo signals arise. Specific way of the echo pattern formation in it anisotropic medium seems to be important for interpretation of acoustic images and results of local elastic measurements with convergent ultrasonic impulses.