THE TRUE FISHES. 171 
Carps (Cyprinidz).—The carps comprise many spe- 
cies, and abound in nearly all streams throughout the 
Old World and North America. They have weak, tooth- 
less jaws. The 
stone-toters (Zx- 
oglossum) puild 
nests by carrying 
stones, which they. 
pileinheaps. The 
dace (Fig. 212), 
commonminnows, 
and shiners, are 
all related. Fic. 212,—Black-nosed dace. 
Nore.—-The dace (Rhinichthys atronasus) is one of the most inter- 
esting of the nest-building fishes. During the breeding-season males 
and females clear away a spot, perhaps under the water-lilies, and in 
the oval depression the eggs are deposited, the pair covering them with 
a layer of stones ; then another layer of eggs is deposited, and another 
of stones, until a mound of eight or ten inches in height is the result, 
and here the young are hatched. 
Blind, Cave-Fishes (Amélyopidz).—These comprise 
three genera and four species of ghostly, sightless fishes 
(Fig. 213) living in the limestone caves of the Middle and 
Fic. 213.—Blind-fish (4mblyopszs), Mammoth Cave. 
Southern States. Though blind, they are supplied with 
sense-organs so delicate that they are enabled to capture 
fishes with eyes that have strayed into their domain. 
