Text-fig. 5. Cryptotis magna, details of the schmelzmuster. a) Detail from the pald more closely to the prd. The REIS of the inner layer is strongly inclined to the right (prd). Because the prisms are almost horizontal, the IPM occurs as a sheet between the rows of prisms. The crystallites of the IPM are perpendicular to the direction of prisms. b) In the protoconid, the two-layered enamel is obvious. In the inner layer, prisms are inclined from both sides, from the pald and prod. The IPM is almost perpendicular to the prisms. The outer layer is of radial enamel. c) The paraconid shows slightly inclined prisms and IPM, and most is radial enamel. d) Detail from the pald. The inner layer is formed by radial enamel with inter-row sheets (REIS). In the left part of the picture, a minimal inclination towards the left (pad) is recognizable. The outer layer is composed of radial enamel. Note the step close to the margin between the two enamel types. It is caused by pigmentation in the outer layers, which hinders the etching. Abbreviations: EDJ – enamel dentine junction, IPM – Interprismatic matrix, p – prisms, pad – paraconid, prd – protoconid. in Tooth Enamel Microstructure In Megasorex Gigas (Merriam, 1897) And Cryptotis Magna (Merriam, 1895) From Mexico - In Comparison To The Schmelzmuster In Other Shrews