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Description of Plate. 



Fig. 1. Chimpanzee. Photomicrograph of part of a Transverse Section through 

 the Posterior End of the Posterior Commissure, showing the Sub - commissural Organ 

 and the Mesocoelic Recess. X ^4. 



Fig. 2. Man (adult). Pliotomicrograph of part of a Transverse Section through 

 the Posterior End of the Posterior Commissure, showing the Irregular Proximal (posterior) 

 part of the Mesoccelic Recess. X ^8. 



Fig. 3. Man (adult). Photomicrograph of part of a Transverse Section through 

 the Posterior Part of the Posterior Commissure at a level slightly anterior to that of 

 the section represented in fig. 2, to show the terminal (anterior) portion of the meso- 

 ccelic recess, with its characteristic columnar epithelium. X 300. 



Explanation of Lettering, 



b. V. blood vessels, gl. globular bodies, m. »■. mesoccelic recess, p. c. posterior 

 commissure, s.e. o. sub-commissural organ. 



