EXPLANATION OF THE PLATES. 



PLATE XXL* 



FIG. 



1. Part of the interior of Cossus ligniperda. (Lyonet.) 



a, 6. The spinal chord and its ganglions, d. The nerves. 

 e. The bronchiae connected with the trachea. 



2. One of the labial palpi of ditto. (Ibid.) 



3. Another view of the interior of ditto. (Ibid.) a. Trachea. 



b. Bronchiae. c. (Esophagus, d. Ventricle or stomach. 

 e. The lower intestines, ff. The bile vessels, g. Se- 

 ricterium, or silk reservoir, h. Sialisterium, or saliva 

 vessel. 



4. Part of one of the tracheae 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 c c. 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. 



