[1171] A harmonic suture is when the margins of two flat bones simply touch each other, without any intermediate substance; and a squamose, when the thin margin of one covers that of the other. Anat. Compar. i. 124. With regard to the flat portions of the integument of insects, they have some motion; whereas a suture is an articulation without movement. Ibid.

[1172] Their connexion by means of a ligament classes them under Synneurosis (Monro On the Bones, Dr. Kirby's edit. 29), but even this not strictly, since a common ligament connects them all. Those of the trunk, as admitting a slight degree of motion, belong to Amphiarthrosis (Anat. Compar. i. 126), and those of the abdomen, which are capable of larger movements, to Diarthrosis (Ibid. 127).

[1173] See above, p. [309]—.

[1174] In the hornet and other wasps, this line on the inside of the head furnishes a foundation for a septum, which in the sides of the nose is very high, and connects also with the hind part of the head.

[1175] Anat. Compar. i. 445—.

[1176] Ibid. 447.

[1177] Mém. sur les Anim. sans Vertèbr. I. i, 11—. Comp. Anat. Compar. iii. 314—.

[1178] It is probable that M. Cuvier took his idea of this first kind of articulation, by contact of solid parts, from this individual insect; since, besides its very prominent throat, there is on each side of the lower part of the occiput a small elevation, or approach to a tubercle.

[1179] Gen. des Crustac. et Ins. ii. 246. Regne Anim. iii. 325.

[1180] This was written directly after the experiment recommended in the text had been tried, with the result there stated.