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Updated: May 28, 2025
In Hylobates syndactylus, as the name expresses, two of the toes regularly cohere; and this, as Mr. Blyth informs me, is occasionally the case with the toes of H. agilis, lar, and leuciscus. It deserves notice that the feet of the sloths, the most arboreal animals in the world, are wonderfully hook- like.
But the wind slides eastward over its opaque surface in vain, till it reaches the living surface beyond. It is glorious to behold this ribbon of water sparkling in the sun, the bare face of the pond full of glee and youth, as if it spoke the joy of the fishes within it, and of the sands on its shore a silvery sheen as from the scales of a leuciscus, as it were all one active fish.
This gibbon is not the only species in the genus which sings, for my son, Francis Darwin, attentively listened in the Zoological Gardens to H. leuciscus whilst singing a cadence of three notes, in true musical intervals and with a clear musical tone. It is a more surprising fact that certain rodents utter musical sounds.
The one was an Apogon, the other an Ambassis, and to each, from the heat of its habitat, he assigned the specific name of "thermalis." In addition to the two fishes above named, a loche Cobitis thermalis, and a carp, Nuria thermoicos, were found in the hot-springs of Kannea, at a heat 40° Cent., 114° Fahr., and a roach, Leuciscus thermalis, when the thermometer indicated 50° Cent, 122° Fahr.
The individuals are very numerous; but they appear to belong to a small number of species, some of which were referred by Agassiz to the genera Leuciscus, Aspius, and Perca. The remains of frogs also, of extinct species, have been discovered in the paper-coal; and a complete series may be seen in the museum at Bonn, from the most imperfect state of the tadpole to that of the full-grown animal.
Hylobates agilis, hair on the arms of; musical voice of the; superciliary ridge of; voice of. Hylobates hoolock, sexual difference of colour in. Hylobates lar, hair on the arms of; female less hairy. Hylobates leuciscus, song of. Hylobates syndactylus, laryngeal sac of. Hylophila prasinana.
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