[251] Vol. III. p. [154]. De Geer ii. 697—. t. xxi. f. 4, 5, 12.

[252] De Geer Ibid. 666—. t. xix. f. 6.

[253] Reaum. vi. 393. t. xxxvi. f. 8, 9. t. t.

[254] Reaum. vi. 395. t. xxxvi. f. 8-9. c. c.

[255] Plate [XXIX]. Fig. 21.

[256] Marcel de Serres (Mem. du Mus. 1819. 137, &c.) calls the tubular tracheæ that receive the air, arterial tracheæ, and the vesicular ones which act as reservoirs, pulmonary tracheæ.

[257] Plate [XXIX]. Fig. 1. 2.

[258] Treviranus Arachnid. 7—. t. l. f. 1. r. f. 10. Comp. N. Dict. d'Hist. Nat. xxx. 419. Latreille calls these gills Pneumo-branches.

[259] Treviranus Ibid. 24. Plate [XXIX]. Fig. 1.

[260] Plate [XXI]. Fig. 3. a b.