loo 



The Microscope. 



of its membranaceous portion i is) much greater, giving it a less' 

 linear pattern, while the inferioi margin has no frill. Fig. 3 gives 

 a transverse section of the barb sliown in figure 1, the shaft 

 of which is distinctly arched'above the|insertions of the barbules, 

 the point of insertion of the posterier series appearing consider- 

 ably below, on the opposite side. The^horny exterior of the barb, 

 thick, and firm superiorly, is seen to diminish in thickness 

 downwardly in the same proportion as does the inclosed pith,. 







which shows three cells in breadth diminishing to two, then to 

 one, after which nothing but the enveloping tissue, that from 

 transparent angulated cells, passes into semi-opaque amorphous 

 matter at the base of the fimbriated bodies\ This section 

 brings into lateral view the barbicels of both the anterior and 



1 Aa seen in Fig. 6, which represents the vellum of the barb and its frill. 



