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Show 424 DR. MURIE ON SACS VOMITED BY HORNBILLS. [June 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 network 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 upright cylinders, inferior prolongations, and superior free columnar epithelium. 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 ; together with the intermediate substance or epithelio-granular meshwork. 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 uprightly. H. Horizontal section from about the middle of E, showing absence of the cylinders and that it is composed of epithelium and nucleolar corpuscles in various stages of development. I. Some of the polygonal or tessellated, horny, nucleated scales of H , enlarged. , J. Another view of the epithelium, showing transition from oval to elliptical character. granules of various stages of development throughout its entire thickness. These, moreover, appear to be piled in tiers, marked by |
