368 0. C. Marsh on the Metamorphosis of | 
above, and in outline more oval. The neck also diminishal 4 
in size, and the snout became more pointed. The changein 
the eyes, already alluded to, likewise altered the appearanceaf 
the head materially. The flat, fish-like eye of the Siredon 
projected very slightly above the surface of the head, but — 
during the transformation this organ became more conyex, and 
also much more prominent (figures 2 and 3), This change in 
the eye was apparently indicated also in the habits of the ani- 
mal, The Siredons seldom missed their aim in catchinga — 
worm or insect, but when under water after the metamorphosis — 
they often made several ineffectual attempts to seize objects 
quite near them. oe 
ne of the most interesting features of the transformation — 
occurred in connection with the mouth of the animal, The — 
opening, or gape, increased considerably in size, one half at — 
least ; the internal and external nostrils became perce : 
E 
oO 
os 
me 
—s 
om 
je] 
5 
os 
i) 
f=] 
Qu 
2. 
oO 
et 
°o 
os 
S 
&P 
= 
Ss 
pie 
i=) 
4 
& 
ss) 
ct 
eZ 
interrupted in front, and to some extent on the sides, as repre . 
sented in figure 1b, which shows the position of these teeth, 7 
but not their exact number or size. After the nein 
ferent individuals that had apparently passed through the samy 
external phases of transformation, although the tendency, ore 
