LOSS OF EYE-PIGMENT IN GAMMARUS. 319 
Matings :—(3) with male II.B. (R+A); 146 young, 33 
Black, 44 Red, 69 Albino. 
VI.A.2.1. Female, Albino carrying Black and Red. 
Matings :—(1) with male VI.A.3.t. (R+A); (6 young, 
1 Red, 5 Albino). 
The female died after extruding this brood ; the proof of her con- 
stitution was obtained by mating the young, when mature, together 
and with mates of proved constitution. The red one was a male, 
the albinos were one male and four females. The Albino male and 
one female mated; 9 young, all Albino. The female was then 
mated with the Red male, and gave in 38 young, 13 Black, 8 Red, 
17 Albino. (The albino male mated with a Pure Red female had 
31 young, all Red.) 
VI.A.2.m. Female, Albino carrying Black and Red. 
Matings :—(1) with an Albino male of the same brood ; 
5 young, all Albino ; 
(2) with male h of the same brood, (A+ B+ 
R); (25 young, all Albino) ; 
(3) with male j of the same brood, (A+R) ; 
(1 young, Albino ;) 
(4) with male VI.B.3.d.; no results ; 
(5) with male VI.B.3.a. (R+A); (33 young, 
6 Black, 14 Red, 13 Albino). 
VL.A.3.y. Male Albino carrying Black only. 
Matings :—(1) with female VI.B.2.q. (Red, albinism not 
known) ; | young, Black ; 
(2) with female I.E.2.f. (R+A); 15 young, 
3 Black, 12 Albino. 
VI.A.3.z. Male, Albino carrying Black and Red. 
Matings :—(1) with female VI.B.2.n. (Pure 
Red) ; 15 young, 10 Black, 5 Red. 
VI.A.3.aa. Male, Albino carrying Red only. 
Matings :—(1) with female VI.B.2.0. (Pure Red); 12 
young, all Red ; 
(2) with female VI.A.2.k. (A+B+R); (42 
young, all Albino) ; 
(3) with female VI.A.2.d. (B+ A); (18 young, 
8 Black, 10 Albino) ; 
(4) with female VI.A.2.e. (B+ A) ; (29 young, 
13 Black, 16 Albino) ; 
