Fishes . # ^ TT,. 20 S,one-n,ll,. > ,..s,o,m, ,n, (). Family Cwpnmd^. ^ ShTSg mial tube;cles and intestines coiled about the ar-bladder. is very long and much convoluted while ^^ those jhichfeed on other fishes it is always relatively short. In thestone roller, a fresh-water minnow ) found m theSsissippi Valley, the excessively long -t-tmes ^^^^^^^^^^^veeetable matter are wound spool-fashion about the arge airbladder Tn all other fishes the air-bladder lies on the dorsalside of the intestinal Fio. 21 .-Skeleton of the Cow-fish, Lactnphrys triconu. (L
Fishes . # ^ TT,. 20 S,one-n,ll,. > ,..s,o,m, ,n, (). Family Cwpnmd^. ^ ShTSg mial tube;cles and intestines coiled about the ar-bladder. is very long and much convoluted while ^^ those jhichfeed on other fishes it is always relatively short. In thestone roller, a fresh-water minnow ) found m theSsissippi Valley, the excessively long -t-tmes ^^^^^^^^^^^veeetable matter are wound spool-fashion about the arge airbladder Tn all other fishes the air-bladder lies on the dorsalside of the intestinal Fio. 21 .-Skeleton of the Cow-fish, Lactnphrys triconu. (Linnxus). The Organs of Reproduction 33 The Eggs of Fishes.—The great majority of fishes are ovipa-rous, the eggs being fertilized after deposition. The eggs are laidiiT gravel or sand or other places suitable for the species, and themilt containing the sperm-cells of the male is discharged over oramong them in the water. A very small quantity of the sperm-fiuid may impregnate a large number of eggs. But one sperm-cell can enter a particular egg. In a number of families thespecies are ovoviviparous, the eggs being hatched in the ovaryor in a dilated part of the oviduct, the latter resembling a realuterus. In some sharks there is a structure analogous to f^ ^-^>:^^-
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Keywords: ., bookcentury1900, bookdecade1900, bookpublisher, booksubjectfishes
