578 AMBLYSTOMA LURIDA. 
Tue DEVELOPMENT OF AMBLYSTOMA LURIDA SAGER.—By Dr. P. 
Hor. 
Tuts, the largest of the North American salamanders, affords 
superior facilities for studying the habits and embryonic changes 
from the egg to the perfected reptile. The adult female of this 
species is from eleven to twelve inches in length. The male 
is rather less. They excavate holes in the ground in which they 
conceal their bodies, the head only being visible. Thus they 
Fig. 108. lie in wait for stray slugs and insects 
on which they subsist. Late in the 
fall they stray about seeking a hiding 
place in which to hibernate, at which 
time they frequently find their way 
into cellars to the great consterna- 
tion of the household. 
Early in the spring they repair to 
neighboring ponds, in which to de- 
posit their eggs, which they place in 
LIN packets of from twenty to fifty on 
' blades of coarse grass. The eggs 
Egg of Ambiystoma, at 13th day are one half inch in diameter, the 
Lower figure of natural size, 
albumen has considerable firmness, 
the yolk is one eighth of an inch in diameter, color, greenish olive, 
paler beneath. I will here omit reciting the development of the 
embryo previous to the escape of the tadpole from the egg, as 
there is no essential difference between the development within the 
egg of the salamander and that of the fish which has been so 
repeatedly studied with great care and the Fig. 109. 
results recorded with minute exactness. 
7 blystoma, 10th day 
mentary. May 5, tenth d vere een, Lower figure 
oo day, ina develop ed, iy poco os at time of 
se g from egg. 
insects. May 25, thirty days from the egg, fore feet tridactylous, 
consisting of thumb, forefinger, which is greatly elongated, and 
