x, Ball-and-socket joint, by which the root of the wing is attached to the cylinder, as in fig. [122], p. 239.—Original.
Fig. 124.
Fig. 124.—Flexible elastic wing with tapering elastic reed (a b) running along anterior margin.
c, d, Posterior margin of wing. i, Portion of wing composed of one layer of flexible material. h, Portion of wing composed of two layers. g, Portion of wing composed of three layers. f, Portion of wing composed of four layers. e, Portion of wing composed of five layers. x, Ball-and-socket joint at root of wing.—Original.
Fig. 125.
Fig. 125.—Flexible valvular wing with india-rubber springs attached to its root.