424 DR. MURIE ON SACS VOMITED BY HORNBILLS. [Julie 16, 



ing nevertheless with parts, other than that above described, of the 

 large sac. The most notable and obvious distinction, then, consists 

 in the absence of the homogeneous pillars and therefore looped net- 

 work of intermediate substance. Instead of these, there are but 

 continuous wavy and horizontally stratified layers of epithelium and 



Fig. 2. 





Illustrations of the microscopical tissues and elements forming the sacs ejected 

 by the Subcylindrical Hornbill. 



A Vertical section, through the entire thickness of the part, exhibiting up- 

 right cylinders, inferior prolongations, and superior free columnar epi- 

 thelium. 



B. Small piece of the same, more highly magnified. . 



C Horizontal section from about the middle of A, displaying the cylinders or 

 aggregate rods both somewhat obliquely and when cut straight across ; to- 

 gether with the intermediate substance or epithelio -granular meBhwork. 



D. Still further enlarged piece of the same section. 



E Protruding cylinder of rods, very considerably magnified. 



F. Vertical section (corresponding to A), showing no cylindrical arrangement, 



but wavy stratified layers of an epithelial character. 



G. Partial layer of its epithelium under a higher power, but transposed up- 



H Horizontal section from about the middle of E, showing absence of the cy- 

 linders and that it is composed of epithelium and nucleolar corpuscles in 

 various stages of development. 

 Some of the polygonal or tessellated, horny, nucleated scales of H, enlarged. 

 Another view of the epithelium, showing transition from oval to elliptical 

 character. 



I. 



J. 



granules of various stages of development throughout its entire 

 thickness. These, moreover, appear to be piled in tiers, marked by 



