Concerning _Doras_, Dr. Günther observes: "These fishes have excited attention by their habit of traveling during the dry season from a piece of water about to dry up in quest of a pond of greater capacity. These journeys are occasionally of such a length that the fish spends whole nights on the way, and the bands of scaly travelers are sometimes so large that the Indians who happen to meet them fill many baskets of the prey thus placed in their hands. The Indians suppose that the fish carry a supply of water with them, but they have no special organs and can only do so by closing the gill-openings or by retaining a little water between the plates of their bodies, as Hancock supposes. The same naturalist adds that they make regular nests, in which they cover up their eggs with care and defend them, male and female uniting in this parental duty until the eggs are hatched. The nest is constructed, at the beginning of the rainy season, of leaves and is sometimes placed in a hole scooped out of the beach." =The Sisoridæ.=—The _Sisoridæ_ are small catfishes found in swift mountain streams of northern India. In some of the genera (_Pseudecheneis_) in swift streams a sucking-disk formed of longitudinal plates of skin is formed on the breast. This enables these fishes to resist the force of the water. In one genus, _Exostoma_, plates of skin about the mouth serve the same purpose. The _Bunocephalidæ_ are South American catfishes with the dorsal fin undeveloped and the top of the head rough. In _Platystacus_ (_Aspredo_), the eggs are carried on the belly of the female, which is provided with spongy tentacles to which the eggs are attached. After the breeding season the ventral surface becomes again smooth. =The Plotosidæ.=—The _Plotosidæ_ are naked catfishes, largely marine, found along the coasts of Asia. In these fishes the second dorsal is very long. _Plotosus anguillaris_, the sea catfish of Japan, is a small species striped with yellow and armed with sharp pectoral spines which render it a very disagreeable object to the fishermen. In sandy bays like that of Nagasaki it is very abundant. Allied to this is the small Asiatic family of _Chacidæ_. =The Chlariidæ.=—The _Chlariidæ_ are eel-like, with a soft skeleton and a peculiar accessory gill. These abound in the swamps and muddy streams of India, where some species reach a length of six feet. One species, _Chlarias magur_, has been brought by the Chinese to Hawaii, where it flourishes in the same waters as _Ameiurus nebulosus_, brought from the Potomac and by Chinese carried from San Francisco. =The Hypophthalmidæ and Pygidiidæ.=—The _Hypophthalmidæ_ have the minute air-bladder inclosed in a long bony capsule. The eyes are placed very low and the skin is smooth. The statement that this family lacks the auditory apparatus is not correct. The few species belong to northern South America. [Illustration: