[93] Callithrix sciurea.
[94] It appears to be a long-backed little thing, and this is not because it has more rib-bearing back-bones than the Monkeys of the Old World; on the contrary, they usually number only eleven. As regards the skeleton, the hips appear to be weakly joined on to the spine and to each other by one bone, instead of there being a long and strong sacrum to unite them. The breast-bone has only four pieces between the upper one (or the manubrium), and the cartilage at the lower end.
[95] Callithrix lugens.
[96] Callithrix discolor.
[97] Nyctipithecus trivirgatus.
[98] Nyctipithecus rufipes.
[99] Nyctipithecus oseryi.
[100] Pithecia.
[101] Pithecia Satanas.
[102] Pithecia hirsuta.