Hyalella Knickerbokeri 245 
number of eggs increased from eighteen to forty-four as the age of the 
animal increased. 
90 Hin 
: 5 Sbapseg sesunces eaee 
se ae ce 3 Sl 
H H HH ast ists 
a H sdad edane 
HE 
sca ieaftae 
Bort dane He te 
H suas { EPEEEALEY 
Haat cH Bie 
a } a att + + as 
H at A 
+ ia r 
EB A + . pe gees A a suas dddae 
so sececcsess EEEEECHEEE HEE EE sacagsant 
7014 ais seaueeee CREE et sgguseesns cas 
: f aa 
1 ude amt tr oe 
caus = ap Tas 
t : F 
+f 
Seiettt ura azz da FF ae 
A HE edees EEE Ht HH isdengeaedea 
Saususes + rH 
baa y H H Toast ine | r+) He 
HH ; A 
605; is HH ra 
a 1 Pct t jseuaseag 
rt + Ht + 
Et at EH eee 
HH sate A poessseel 
i fines THe H isaaras tana RES 
50 Geeee cen + LH G By EH ia 
: Ht tt Ete te 
+ 4 CH aa geeat 
HH t { te i ra H Ht i 
uh me Bulle 
jeazaderegaed H ELSE HE aati 
mE 4 cf aan 
H t at tH EERE t HH i Tot 
i ian: Eneriany EEE ES boa 
+ saa sage as i 
+ HH poses ea e t 
FA sguesaassaaee a : 
1 tt Ht aa 
HH att 
pr ‘ 
H PH as + 
25} z 
£ t 
EE 4 = 
ry ; ao t 1 ie 
4 st i 
= pes zs 
s a it EE ry Ht aoe ceee 1 + 1 
‘. 
+ 
H : H 
T 
‘ ty. + +H 
tof: : 
+ EH 
: ; 
t 
() 5 10 15 20 25 39 
FIGURE SS. 
Figure 5. Ordinate and abscissa same as in Figures 2, 3, and 4. 
Includes all broods extruded between June 27 and September 26, 1920, 
a total of 293 broods. 
