The Dentition of the Genus Hapale, or the Marmosets, or Ouistitis--The Face--The Paw-like Hands and Feet--Their Claws--The Skull and Brain, and the Nature of the Diet--THE COMMON MARMOSET--Its Habits--THE CLOAKED MARMOSET--THE GENUS MIDAS--THE TAMARINS--Their Dentition--THE NEGRO TAMARIN--Its Habits--MIDAS ARGENTATUM--DEVILLE’S MIDAS--THE SILKY TAMARIN--Notes on the Arctopithecini in general. The second division of the Monkeys of the New World is characterised by there bring thirty-two teeth, and the tail is not prehensile. It is generally termed that of the Marmosets, or in scientific language, the Arctopithecini, a word which means Bear-Monkey. There are two genera in this division: the first is that of the Marmosets proper, or genus Hapale; and the second is that of the Tamarins, or genus Midas. THE MARMOSETS, OR OUISTITIS.[108] In this genus the thirty-two teeth are so arranged that instead of there being three back teeth, or true molars, on the side of each jaw, they have only two. But there are false molars placed in front of these two crushing molars, and this has a direct relation to the insectivorous diet of the animal. The outer edge of these false molars has one sharp point, admirably adapted to pierce a hard-coated Beetle, or to smash up a grub. The incisor, or front teeth, differ in the two genera. They are long (especially the lower ones), narrow, and are curved outwards, and they stick out forwards from the jaw in the genus Hapale. Those of the Tamarins are short and broad, the lower ones being stuck out and close together. The lower canine teeth of the Hapale, or Ouistitis, are very small, and those of the other genus are larger.