R. (J. PUNNKTT 



43 



were indistinguishable from the corresponding colours which are 

 homozygous tor B. But th(! agouti-blacks heterozygous for B are 

 i:i appearance (juite distinct from those that are homozygous. The 

 agouti hairs ai'e very much more marked and spread througlujut the 

 coat (cf Punnett, 1912, PI. XII, figs. 1 and 2). Such rabbits are in 

 constitution DdEEAaBb. Additional animals of like appearance and 



choc. X F; agouti-black x yellow 



I i I r^T 1 



blk ag. clioc. X ag.-blk agouti blk x choc. blk x choc. 



(D96) (^63)1 (f 69) I 



I ^. I .1. 



choc. X ag.-blk 

 {F 227) 

 (F 228) 



ag. X choc. ag. 

 (F141) I (£239) 



agouti 



ag. blk ag. ag.-blk x choc. 

 (£179) I 



ag.-blk blk cinn. ag. deep choc, x ag. 



cinn. ag. (G 51) 



I 

 agouti 



agouti 



(F141) 

 black 



Fig. 2. 



constitution were made by mating the chocolate buck with two agouti- 

 throwing black $ ? (F6S and F6d) ex F. agouti-black x yellow (cf 

 Fig. 2). Four agouti-black ^ $ , all of which were heterozygous for 

 B (D96, ^^179, i^227, and i' 228 in Fig. 2), were then mated back 

 with the chocolate buck. As shewn in Table V they produced yoimg 

 of 6 kinds, viz. agouti, agouti-black', and black, together with the corre- 

 sponding chocolate forms, cinnamon, deep cinnamon, and chocolate. 



' These were all of the type which previous experience has shewn to be heterozygous 

 for chocolate. 



