
132 ALLEN’S NATURALIST’S LIBRARY. 
The Marmosets are all gentle and playful in disposition, and 
are, on this account, very largely brought to Europe as pets; 
but they are very delicate, and rarely survive long in confine- 
ment after the advent of the Northern winter. “They are 
arboreal, living in troops, and feeding on insects and fruit, and 
not disdaining flesh, especially of fishes, when they can obtain 
it. They emit a characteristic chirping noise. 
I. THE COMMON MARMOSET. HAPALE JACCHUS. 
Simia jacchus, Linn., Syst. Nat., i., p. 40 (1766). 
Jacchus pencitlatus, Geoffr. Ann. Mus., xix., p. 119 (1812) ; Spix, 
$20. p; 34, pl. 26 (1823). 
Jacchus leucocephalus, Geoffr., t. c. p. 119. 
Jacchus vulgaris, Geoffr., t.c. p. 119; Gray, Cat. Monkeys 
Brit. Mus., p. 63 (1870, in part). 
Hapatle jacchus, Kuhl, Beitr., Zool., p. 46 (1820) ; Schleg., Mus. 
Pays Bas, vii., p. 271 (1876). 
Hapale albicollis, Spix, Sim. et Vespert. Bras., p. 33, pl. 25 
(1823); Geoffr., Cat. Méth. Primates, p. 59 (1851). 
Characters.—Head small; eyes gentle ; nose flat ; face black, 
with a white spot in front ; ears naked, with a tuft of long hairs 
on the front edge of its opening, either black, white, or grey ; 
hair of the sides of the head elongated ; back cross-banded 
with black and grey, the hair at the base dusky, reddish-brown 
in the middle, grey at the top. ‘Tail banded with black or 
grey. 
Several species have been described under the names of the 
White-necked Marmoset (ZZ. addicollis, Spix), the Black-eared 
Marmoset (47. penici//ata, Kuhl), and the White-headed Mar- 
moset (/7. /eucocephala, Kuhl), but Dr. Gray considered these 
to be only varieties of the common species, which has some- 
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