1925] 
Storer: A Synopsis of the Amphibia of California 
225 
Other areas in this same pond which seemed to be of exactly the same 
character were not utilized by the species. 
The total number of eggs deposited by a single female has been 
ascertained in two cases. A mated pair was taken from the Thornhill 
pond on January 31, 1914, and confined in an aquarium. Next morn- 
ing a total of 730 eggs was found. The average number of eggs in a 
clump was 18. Another captive which began laying on the night of 
March 7, 1922, and continued up until 4 p.m. of the day following 
deposited a total of 1250 eggs ; the average of the 58 masses laid was 
between 21 and 22. The largest mass contained 60 eggs and there 
were two with the minimum of 9. 
The outer jelly coat on the eggs of Hyla regilla is a thick soft 
viscid layer which serves admirably for affixing the eggs to sticks or 
leaves in the water (pi. 14, fig. 42). In the water this layer expands 
so that the outlines of the individual eggs are largely obscured. 
Within this thick soft covering is a thinner but firmer jelly coat which 
closely surrounds the egg (text fig. Y). When the egg is in the early 
stages of cleavage this inner coat is spherical ; later it becomes drawn 
out at opposite poles to a lozenge shape. The following table gives 
measurements of eggs obtained at Thornhill pond in 1922 ; dimensions 
are in millimeters : 
Vitelline 
Inner 
Outer 
Egg 
capsule 
jelly coat 
jelly coat 
Minimum 
1.23 
1.29 
1.88 
4.7 
Maximum 
1.35 
1.41 
2.70 
6.7 
When freshly laid the eggs are light olive brown on the animal 
pole and white with a very pale yellowish (sometimes greenish) tinge 
on the vegetative pole. 
Most of the eggs of this hyla in the vicinity of Berkeley are 
spawned at night ; when the ponds are visited in the morning it is 
the usual thing to find the eggs in the 2-cell or 4-cell stage. Develop- 
ment to the stage of hatching, at Berkeley, is accomplished in about 
two weeks. Eggs spawned on the night of January 31, 1914, and kept 
in a laboratory where the temperature averaged about 20° 0. (68° F.) 
hatched on February 6. 
Newly hatched larvae, within 24 hours of leaving the jelly, 
measure 6.0 to 7.5 millimeters in total length; the head-and-body 
length is about 3 millimeters, the greatest height over the fins 1.3 tr 
