EXPLANATION OF THE PLATES. 
PLATE XX I. a 
no. 
1. Part of the interior of Cossus ligniperda. (Lyonet.) 
a, b. The spinal chord and its ganglions, d. The nerves. 
e. The bronchia? connected with the trachea. 
2. One of the labial palpi of ditto. (Ibid.) 
3. Another view of the interior of ditto. (Ibid.) «. Trachea. 
b. Bronchia?, c. (Esophagus, d. Ventricle or stomach. 
e. The lower intestines, ff. The bile vessels, g. Se- 
ricterium, or silk reservoir, h. Sicdisterium, or saliva 
vessel. 
4. Part of one of the trachea; of ditto, to show its coats and 
spiral thread. (Ibid.) Vol. IV. p. 63. 
5. A portion of the interior of ditto, to show the epiploon, or 
fat. (Ibid.) a a. Epiploon. Vol. IV. p. 150. 
6. Leg of ditto laid open. (Ibid.) a a a. Semipenniform 
muscles of ditto, b. Their lower point of insertion in 
the claw. c. Muscles of the coxa. Vol. IV. p. 185. 
7. Nervous system of the grub of Onjctes nasicornis. 
(Swamm.) a. The first ganglion or brain. c. The 
remaining ganglions, forming a thick spinal chord. 
d. The nerves issuing from them. 
8. of the louse. (Ibid.) a. The brain. 
c cc. The ganglions, d. Nerves. 
9. The spinneret, or organ that renders the silk of the Cossus. 
(Lyonet.) Vol. III. p. 124. 
* Vol IV. Letters XXXVII. and XL. 
