1891.] The Vermilion-Spotted Newt. 1103 
4. After the gills are absorbed the animal leaves the water, and 
the color gradually changes from an olive-green to brownish-red, 
and finally, during the same season, assumes a bright yellowish- 
red, the vermilion spots remaining and becoming partly surrounded 
by black pigment. 
5. As the terrestrial life is assumed the stratified, non-ciliated 
oral epithelium of the aquatic larva gradually changes to a ciliated 
epithelium continuous with that of the cesophagus. 
6. In the autumn of the third or the spring of the fourth year 
after hatching (when two and one-half or three years old), the 
red changes for a viridescent coloration. This may occur with 
or without entering the water. If the water is entered the animal 
changes to an aquatic mode of life. 
7. On reassuming an aquatic life the ciliated, oral epithelium 
becomes again stratified and non-ciliated, as in the aquatic larva, 
and as in Necturus and Cryptobranchus. 
8. After becoming adult and transforming to the viridescent 
coloration, the Diemyctylus always remains of that general 
color, and never again becomes red, even when kept out of water 
a whole year, thus showing that the coloration is dependent 
neither on food, season, nor environment, but is normal for a 
given period of life only. 
9. The adult viridescent forms are purely aquatic under favor- 
able conditions, and after once entering the water do not leave it, 
although they are able to live for several months, and perhaps 
indefinitely in moist places, wholly out of water. Rhythmical 
pharyngeal respiration isjverymarked both in air and under water. 
10. The character of the oral epithelium seems directly depen- 
dent on the mode of respiration, being stratified and non-ciliated 
with a purely aquatic or a mixed respiration, and ciliated with a 
purely aérial respiration. 



