170 TELEOSTOMES 
ber, and from its peculiar life habit retains permanently 
a number of its embryonic characters; it has thus its 
elongated larval form, a functional pronephros, a noto- 
chordal skeleton and immature fin conditions (Emery, 
Ref. p. 249). 
To what degree the structures of fishes may be varied 
by artificial selection is an interesting question, but one 
that has as yet received little attention even from those 
who have made artificialization an especial study. In the 
instance of the Go/dfish it is well known how wide a 
Fig. 176. — Goldfish, Carassius auratus (‘‘Telescope” variety). x1. (After 
GUNTHER.) Japan. 
variation has been produced in colour, size, and proportions. 
Fin structures are elaborately developed, long, drooping, 
lace-like, often to a degree which must render progression 
both slow and difficult. Even the eyes have been made 
to become large and protruding (Telescope-fish, Fig. 176). 
In carp the variation in scale character, due to artificializa- 
tion, is also to be mentioned. It is natural, perhaps, that 
artificial selection has been most successfully practised 
