550 



F. W. (lAMBLE. 



of this substance might conceivably influence the subsequent 

 colour-history. It seemed, therefore, advisable to obtain 

 more records of this varying proportion of red pigment, and 

 also to determine the conditions which favour or inhibit its 

 development. 



The results obtained are shown in the adjoining Table, and 

 are derived fromastudyof the offspring of some twenty parents. 

 Larvfe from those Hippolyte which are pink, red, or brown, 

 possess a fair amount of the red pigment in their chromato- 

 phores at the time of hatching (the greatest amount in the 

 samples examined being in the red-lined female broods). 

 Larvte from colourless (extremely pale pink) female varians 

 are devoid of red pigment ; whilst larva? of green parents 

 occupy an intermediate position, some batches being coloured 

 like those of brown or pink parents, but not so deeply ; others 

 from equally good green parents exhibit no red; and others, 

 again, exhibit, unlike all the preceding cases, an inconstancy, 

 and show traces of the red pigment in only 36 per cent, or so 

 of the offspring. 



Hippolyte varians. 



Numher Hud colour of fenmle pareut. 



Amount of red i)iginent in the just-hatched 

 larva". 



Mncli ; constant. 



Fair amount : constant. 



Traces onl}' in some, fair in rest. 



Fair amount ; constant. 



Fair amount ; constant. 



Ti-aces in 36 % of larv* examined. 



Absent. 



Absent. 



These results are of interest in several Avays. Tliey confirm 

 on the whole the earlier conclusion that excessively red colour 

 in the parent is associated generally with excess in the early 

 larvce; but they also show that the offspring of green female 

 varians show two types of coloration, namely, that with some 

 red pigment and that with none; and further that the two 



