No: 2] THE ADHESIVE ORGAN OF AMIA. 487 
sae general arrangement that they had before the degenera- 
tion began. There is no yolk present and the entire contents of 
the cells are therefore much more transparent than formerly. 
The nuclei have the same peripheral position as before, but 
the central ends of the cells are no longer distended with 
mucus; the goblet character is not retained. Stellate mesen- 
chyme cells crowd close about the organ on all sides, separat- 
ing it from the superior, maxillaries which lie immediately 
back of it, from the lateral line canals which lie deep below 
Jes 
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Sece 
SS 
2 
Fic. H.—Longitudinal section of the tip of the upper jaw of a 20 mm. 
larva of Amia with adhesive organ in final stage of degeneration. 
Camera outline, & about I50. Ic., leucocytes. Other lettering as in 
Fig Io. 
the surface, and from the epidermis except at the point where 
the epidermis dips down to form the tunnel through which 
the four median cups communicate with the exterior. Here, 
in the walls of the tunnel, the cells of the adhesive organ are 
continuous with the cells of the epidermis. 
This tunnel is not a single, simple tube, but is divided just 
below the epidermis into two lateral branches, one of which 
goes to each half of the adhesive organ. Each of these 
branches is also bifurcated so that there are formed in al! four 
