LOSS OF EYE-PIGMENT IN GAMMARUS. 281 
Ill.O. Female, Black carrying Albino. 
Matings : (1) with male E of the same brood, (B-+-A) ; 
(5 young, 4 Black, 1 Albino) ; 
(2) with male G of the same brood, (B+ R-+ 
A); (33 young, 22 Black, 2 Red, 9 
Albino). 
I1I.P. Female, Black carrying Albino. Red factor not proved. 
Matings :—(1) with male F of the same brood (B+ <A) ; 
(69 young, 53 Black, 16 Albino). 
I11.Q. Female, Black carrying Red and Albino. 
Matings : (1) with male H of the same brood, (B+R+ 
A); (111 young, 66 Black, 26 Red, 19 
Albino) ; 
(2) with a male from the same brood, (B+ 
R-+A); 19 young, 10 Black, 6 Red, 3 
Albino. 
The one remaining Black-eyed animal, a male, died without 
mating. 
IV.A. Male, Black carrying Red and Albino (Plate I). 
Matings :—(1) with female N of the same brood, (B+ A) ; 
6 young, 2 Black, 4 Albino ; 
(2) with female T of the same brood, (B-+-R+ 
A); 108 young, 64 Black, 21 Red, 23 
Albino. 
IV.B. Male, Black carrying Albino. Red not known. 
Matings :—(1) with female O of the same brood, (B+ A) ; 
91 young, 70 Black, 21 Albino. 
IV.C. Male, Black carrying Red and Albino. 
Matings :—(1) with female P of the same brood, (B+ R-+ 
A); 61 young, 38 Black, 9 Red, 14 
Albino. 
IV.D. Male, Black carrying Red and Albino. 
Matings :—(1) with female Q of the same brood, (B+ 
R+A); 40 young, 22 Black, 8 Red, 10 
Albino. 
IV.E. Male, Black carrying Red and Albino. 
Matings :—(1) with female R of the same brood, (B+ 
R-+A); 49 young, 28 Black, 7 Red, 14 
Albino ; 
(2) with female Y of the same brood, (R-+ A) ; 
19 young, 10 Black, 5 Red, 4 Albino. 
