Folsom. — Mouth-Parts, Orcliesella ciucta. 



PLATE 1. 



Fig. 1. External aspect of the mouth. X 116, 



Fig. 2. Diagram of the head, seen from the right side, to show the relations 

 between certain organs. X 55. The small figure in a circle represents 

 the natural size of the head. 



Fig. 3. Eeconstruction from sagittal and parasagittal sections of the left half of 

 the head, imagined as seen from the right side. The numbers 28, 29, 

 30, and 31 refer to figures of Plate 4, bearing corresponding numbers, 

 which represent transverse sections made in the positions of the num- 

 bered lines of this figure. X 220. 



Fig. 4. Transverse section of the cesophagus. X 530. 



Fig. 6. The tentorium, viewed from the right side; reconstructed from serial 

 sagittal sections. X 220. 



Fig. 6. Dorsal aspect of the tentorium ; reconstructed from frontal sections. 

 X 220. 



Fig. 7. Sagittal section passing through the tentorium and adjacent structures. 

 X 440. 



Fig. 8. Parasagittal section of the labrum. X 220. 



