ASSIMILATIVE COLOURATION. 463 
relates of a Lioness that was killed, ‘‘she had four unborn whelps, 
with downy skins, striped like the Tiger.” * It still appears that 
the young of many unicolorous animals are spotted. ‘‘ Pigs and 
Tapirs are banded and spotted when young; an imported young 
specimen of T'apirus bairdi was covered with white spots in 
longitudinal rows, here and there forming short stripes. Even 
the Horse, which Darwin supposes to be descended from a 
striped animal, is often spotted, as in dappled Horses; and 
great numbers show a tendency to spottiness, especially on the 
haunches.” fF 
Similar markings are to be found in the young of many 
fishes. Larval Cod have black transverse bars, ‘‘the stellate 
black chromatophores arranged in bands are clearly indicated.” { 
Young Ling (Molua molva), when grown to a length of seven 
inches, pass through a very distinct barred stage.} The young 
of all the Salmonide are barred; ‘‘and this is so constantly the 
case that it may be used as a generic, or even as a family 
character, not being peculiar to Salmo alone, but also common to 
Thymallus, and probably to Coregonus.’ || When the fry have 
attained a length of some four inches, they are known by the name 
of “ parr,’ and “bear conspicuously on their bodies transverse 
marks or bars, which are common to the young of every member 
of the Salmon family.”’{_ Even as regards the colouring of 
British land and freshwater Mollusca, the view has been held that 
Helix cantiana, H. cartusiana, &c., were once banded species.** 
Taking the cases of the Lion, Puma, and Cheetah, we see that 
the two first, unicolorous in their adult stage, apparently show 
by their spotted young a derivation from a similarly coloured 
ancestor, whilst the spotted Cheetah, from the apparent evidence 
of its unicolorous young, would point to a totally different con- 
clusion. But the cumulative opinion of evolutionists is that all 
* “Wand. and Advent. in Int. 8. Africa,’ vol. i. p. 220. 
+ A. R. Wallace, ‘ Darwinism,’ p. 290. 
{| McIntosh and Masterman, ‘ Life-histories Brit. Marine Food Fishes,’ 
p. 238. 
§ Ibid. p. 33, fig. 8, and p. 281. 
|| ‘Roy. Nat. Hist.,’ vol. v. p. 494. 
{] Ibid. p. 497. 
** Cf. “Val. Address,” ‘Journ. Conch.,’ April, 1888; and Boycott, 
‘Zoologist,’ 3rd ser, vol. xx. p. 62, 
