Fishes . adoxa 3 months after hatching. (After Kerr.) movement of the grass in the bottom of the swamp. Whentaken the body is found to be as slippery as an eel and as mus-cular. The eggs are laid in underground Inirrows in the 1)lack Subclass Dipneusti, or Lung-fishes 245 peat. Their galleries run horizontally and are usually two feetlong by eight inches wide. After the eggs are laid the maleremains curled up in the nest with them. In the spawningseason an elaborate brush is developed in connection with theventral fins. Protoptcrns, a second genus, is found in the rivers of Africa,with three s
Fishes . adoxa 3 months after hatching. (After Kerr.) movement of the grass in the bottom of the swamp. Whentaken the body is found to be as slippery as an eel and as mus-cular. The eggs are laid in underground Inirrows in the 1)lack Subclass Dipneusti, or Lung-fishes 245 peat. Their galleries run horizontally and are usually two feetlong by eight inches wide. After the eggs are laid the maleremains curled up in the nest with them. In the spawningseason an elaborate brush is developed in connection with theventral fins. Protoptcrns, a second genus, is found in the rivers of Africa,with three species, P. aniicctens, P. dolloi, and P. crtliiopicus. The genus has five gill-clefts, instead of four as in retains its external gills rather longer than the latter, andits limbs are better developed. The habits of Protopterus areessentially like those of Lepidosiren, and the two. types havedeveloped along parallel lines doubtless from a common fossil LepidosirenidcB are Fig. 182.—ProiopUrus dolloi Bouleuger. Congo River. Family Lepidosireni(la>. Arthrodires.— The large group of Arthrodires consists ofmailed and helmeted fishes with distinct jaws and other charac-ters separating them widely from the Ostracophores. In thelatest view, that of Woodward and Eastman, these fishes con-
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