LOSS OF EYE-PIGMENT IN GAMMARUS. 283 
IV.P. Female, Black carrying Red and Albino. 
Matings :—(1) with male C of the same brood, (B+ R-+- 
A); (61 young, 38 Black, 9 Red, 14 
Albino). 
IV.Q. Female, Black carrying Red and Albino. 
Matings (1) with male D = of the same brood, 
(B+R+A); (40 young, 22 Black, 8 
Red, 10 Albino). 
IV.R. Female, Black carrying Red and Albino. 
Matings :(1) with male E of the same brood, (B+ R-++- 
A); (49 young, 28 Black, 7 Red, 14 
Albino). 
IV.S. Female, Black carrying Albino only. 
Matings :—(1) with male F of the same brood, (B+ A, 
Red not known); (57 young, 40 Black, 
17 Albino) ; 
(2) with a Black male of the same brood, 
(B+R+A); 14 young, 11 Black, 3 
Albino ; 
(3) with male VI.B.1.d (R+ <A); (18 young, 
13 Black, 5 Albino). 
IV.T. Female, Black carrying Red and Albino. 
Matings :-—(1) with male G of the same brood, (B+ R+ 
A); (61 young, 33 Black, 15 Red, 13 
Albino) ; 
(2) with male A of the same_ brood, 
(B+R+A); (108 young, 64 Black, 21 
Red, 23 Albino). 
IV.U. Female, Black carrying Albino. Red not proved. 
Matings :—(1) with male H of the same brood, (B+ A) ; 
(72 young, 54 Black, 18 Albino). 
IV.V. Female, Black carrying Albino only. 
Matings :—-(1) with male K of the same brood, (B+ 
R+A); (80 young, 63 Black, 17 Red) ; 
(2) with a Black male of the same brood, 
either J., K. or M.; 6 young, 3 Black, 
3 Albino. 
(3) with male VI.A.3.t, (R-+A); (12 young, 
10 Black, 2 Albino). 
Brood V. This brood was unhealthy, only a few surviving to mate ; 
the Blacks were not tried for the Red factor. 
