fig. 1, abnormal flower of Serapias lingua, L., of the natural size; fig. 1 a, upper sepal; 1 b and 1 c, semilabelliform lateral sepals; 1 d, labellum; 1 e and 1 f, petals; 1g, the column; 1 h, basal portions of the lateral sepals and of the labellum, the column having been removed so as to show the course of the three groups of spiral vessels which enter the labellum, and of their branches which supply the lateral sepals: figs. 1 a to 1 h, all magnified. Fig. 2, normal flower of S. lingua, L., of the natural size; 2 a, lateral sepal of the same, slightly magnified. Fig. 3, abnormal flower of subsp. Ophrys Bertolonii, Mor., of the natural size.