A similar disposition of the stomach exists in the Colobi. RUPPELL observed it in the Colobus guereza, and OIVEN* said, that in the Colobus polycongos, the sacculation of the sto mach is produced by the same modification of the muscular fibres as in the Semnopitheci, combined with a great extent of the digestive tunics. A narrow band of longitudinal fibres traverses the lesser curvature of the stomach, and a second band, commencing at the left or blind end of the cavity, puckers it up in a succession of sub-globular sacs along the greater end. The form and the size of the ccecum, and the length and disposition of the intestinal canal in the Colobus, equally corre spond with those parts in the Semnopitheci. About the urinary and genital organs there are but few peculiarities to observe in the monkeys of the Old World. The urinary organs have the same general disposition proper to the human subject ; the male genital parts differ only by the existence of an ossi cuium penis., by the lobulated form of the glans in some species, and by the complicated structure and large development of the vesi cula seminales, especially in the Mandrill.
In the female organs, the form and structure of the uterus are interesting: it resembles that of nzan, and differs from the divided and bicorn uterus of most of the other Mammalia. It is only by a more longitudinal, and we rnay say a more fcetal form, that the uterus of the monkeys differs from the same organ of the human subject in the adult state; whereas in gestation, parturition, lactation, and in menstruation, the monkeys of the Old World offer a great deal of analogy with man kind, as may be seen in the elegant descrip tions which F. Cuvier gives of many species
in his Hist. Nat. des Mammifires. In the clitoris there is no bone ; at least LEUCKART found none in Inuus rhesus, but he observed a bifid clitoris in Cercopithecus sabceus. Ac cording to the observations of G. BRESCHET J. VAN DER HOEVEN and SCHROEDER VAN DER KOLK t, the placenta of the monkeys of the Old World is separated into two lobes, united by vessels. This may be a transition to the cotyledons of the placenta in most of the Mammalia.
The Second Group of Simice comprehends those of the New World, or Cebinee (Sinzitc platyrrhince G. S. possessing a distinct character in the existence of four additional molar teeth, by which the general number of teeth is thirty-six. Their head is distinguished by a more rounded form, by nostrils situated laterally on a large nose. A long, and in some species a prehensile tail ; the want of cheek-pouches and of callosities on the but tocks ; a smaller and less robust body, and a less malicious but more melancholy character, give a very conspicuous and distinguished physiognomy to this group.