ZOOLOGY: A. J. GOLDFARB 
243 
{h) The number of eggs with intact jelly layer also varied in the dif- 
ferent females. Some females contained eggs, nearly 100% of which 
possessed the jelly layer, others as low as 40%, etc. Such reduction 
was correlated with an increase in size, and an increase in the number 
of elliptical eggs. 
TABLE 1 
The Variation in Cleavage with Dif- 
ferent Males or Females 
Toxopneustes 
NUMBER OF 
PER 
CENT 
NUMBER OF 
PER 
CENT 
Females 
Males 
CLEAV- 
AGE 
Females 
Males 
CLEAV- 
AGE 
1 
1 
34 
1 
1 
79 
2 
1 
71 
2 
1 
83 
3 
1 
16 
3 
4 
1 
1 
98 
99 
1 
2 
24 
2 
2 
24 
1 
2 
65 
3 
2 
9 
2 
3 
2 
2 
60 
98 
1 
3 
20 
4 
2 
100 
2 
3 
95 
3 
3 
33 
1 
2 
3 
4 
3 
3 
3 
3 
61 
48 
85 
81 
Arhacia 
1 
1 
34 
1 
1 
99 
2 
1 
71 
2 
1 
25 
3 
1 
16 
3 
1 
57 
1 
2 
24 
1 
2 
83 
2 
2 
24 
2 
2 
64 
3 
2 
9 
3 
2 
30 
1 
3 
20 
1 
3 
98 
2 
3 
95 
2 
3 
93 
3 
3 
33 
3 
3 
50 
TABLE 2 
To Illustrate the Range 
OF Variability in Rate 
OF Membrane Formation 
in Fresh Germ Cells 
NUMBER OF 
MINUTES RE- 
QUJRED FOR 
Females 
Males 
TO APPEAR 
1 
1 
6 
2 
4 
3 
4 
1 
2 
2 
H 
3 
U 
4 
U 
1 
X 
2 
2i 
3 
If 
4 
1 
1 
X 
2 
X 
3 
21 
4 
2§ 
5 
X 
6 
X 
7 
2i 
X Signifies that no mem- 
brane formed in ten minutes. 
(c) The rate of membrane formation also varied in different females. 
In some, the eggs formed membranes within two minutes, in others 
three to ten minutes, in others not at all. Rapid membrane formation 
was correlated with slight variability in size, globular shape of eggs, and 
high percent of jelly layers ; slow membrane formation with the reverse 
conditions. A few examples are cited to illustrate this type of variation, 
in the eggs of different females fertilized by the same males (table 2). 
