LOSS OF EYE-PIGMENT IN GAMMARUS. 293 
VLA.1.g. Female, Black carrying Red and Albino. 
Matings : (1) with male from Pure Red Stock ; 10 young, 
5 Black, 5 Red ; 
(2) with male b, of its own brood ; (27 young, 
23 Black, 4 Red) ; 
(3) with male VI.C.1.m. (R+ A) ; 22 young, 10 
Black, 8 Red, 4 Albino. 
VI.A.1.h. Female, Black carrying Red and Albino. 
Matings :—(1) with male from Pure Red Stock ; 7 young, 
3 Black, 4 Red ; 
(2) with male o of its own brood, Pure Red ; 
31 young, 17 Black, 14 Red. 
That the female carried the factor for Albino was proved by 
mating the young of the first brood, when Black, Red, and Albino 
eyes appeared in the offspring (207 young, 89 Black, 106 Red, 12 
Albino). One Red male was also mated with female VI.C.3.e. and 
one Red male with female VI.B.1.f. and a Black female with male 
VI.B.2.t. 
VI.A.1.j. Female, Black carrying Red, albinism not known. 
Mating :—(1) with male from Pure Red Stock ; 19 young, 
7 Black, 12 Red ; 
VLA.1.k. Female, Black carrying Red only. 
Mating :—(1) with male from Pure Red Stock ; 17 young, 
8 Black, 9 Red. 
Of the young of this brood 11 survived to maturity ; from their 
matings in the bowl 77 young have been obtained, 38 Black, 39 Red, 
but no albino-eyed young have appeared. 
VI.A.1.1. Female, Black carrying Red and Albino (Plate IV, Figs. 1, 2 
and 3). 
Matings :—(1) with male from Pure Red Stock; 73 
young, 39 Black, 34 Red ; 
(2) with male a of its own brood ; (61 young, 
49 Black, 12 Red) ; 
(3) with male VI.C.1.0. (R+ A) ; 82 young, 37 
Black, 24 Red, 21 Albino (and 21 others 
not examined). 
Three other black-eved voung were hatched, two died, immature, 
and the third, a female, which reached maturity was eaten by its 
mate. 
