Figure 2. Douvilleiceras mammillatum (Schlotheim, 1813). (1, 2) GSC No. 21239, GSC Loc. 7598, lateral and ventral views of plaster cast. (3–8) GSC No. 10657, GSC Loc. C-303724; (3, 4) right lateral and ventral views of composite latex peel and plaster cast derived from external mold; (5, 6) left lateral and ventral views of composite plaster cast derived from external mold; (7, 8) ventral and left lateral views of actual specimen. All specimens coated with ammonium chloride.