Even where no nest is made, the eggs and young are sometimes guarded by one or other of the parents, but generally the father. Schneider saw several fishes at the Naples Aquarium protecting their eggs; in one case the male mounted guard over a rock where the eggs were deposited, and swam with open mouth against all intruders. Again, the butter-fish (_Pholis_) of our coasts lays a mass of eggs, and around this future family the father coils his body, just as does the python among the reptiles. Some fishes, as for instance the cat-fishes (_siluridae_), have the curious habit of carrying the eggs in their mouth. A further interesting case of paternal solicitude is furnished by the male fish of the common lump-sucker. The eggs are deposited in large clumps, and the father’s first care is to secure their proper oxygenation. This he does by pressing his head into the centre of each clump, an action which not only prevents the eggs from being too closely crowded, but serves also to press the spawn firmly into the crevices of the rock on which it is always laid. As soon as this is done this fish-father mounts guard over his family. All would-be enemies, such as star-fish and crabs, who make ceaseless efforts to rob the nursery, are driven off. The work of oxygenation is still carried on, and streams of fresh water, so necessary for the young lives, are driven by the careful father into the masses of the eggs. When the young appear new family duties await him, for the fry at once attach themselves to his body and are carried about by him.[29] There are other instances where the young are attached to the body of the parent. Sometimes it is the mother who gives this protection, and bears her eggs attached to the under surface of her body. The lophobranchiate fish incubate their eggs in pouches in the same way as some frogs, and they show elaborate parental feelings. When the young are hatched out, one or other parent, usually the father, carefully guards them, and the pouch then serves as a place of shelter or retreat from danger.