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Show 1866.] DR. J. MURIE ON CERCOPITHECUS ERYTHROGASTER. 381 inches. Body : length from nose to end of tail (in a straight line).. 29i „ length from nape of neck to root of tail 11 ,, girth of chest (at widest) 8 ,, girth of abdomen (at widest) 8 Tail, in length (its point being imperfect) 16 Fore limb : length from shoulder to tip of middle digit . . 10 ,, length from shoulder to elbow 4 „ length from elbow to wrist 4 „ length of manus 2 Hind limb : length in a straight line 12^ ,, length from hip to knee 4 ,, length from knee to ankle 5 „ length of foot 4 Head : length from nose to occiput (following curve) .... 5 „ breadth between the ears 4\ width between the malar bones 2 width between the outer angles of the orbits \\ width between the centres of the two orbits Oj8^ distance from tip of nose to meatus auditorius .... 2\ distance from top of skull to the inferior edge of the lower jaw (following the curve) 2f- >> »> >> girth of head before ears, including mandible .... 7; ears in length 1 ears in breadth Of To preserve the form of the head in the stuffed specimen (now deposited in the British Museum) the skull was retained in the skin ; consequently the cranial bones were unable to be examined. The dentition, however, corresponds to the immature condition of the genus Cercopithecus, the canines (laniarii) being very moderately developed. Dental formula :-Incisors ^-^. Canines ~. Premolars - , Molars J^jj. The opportunity fortunately occurred of comparing its viscera, side by side, with those of a specimen of Cercopithecus diana, Linn., and of C. cephus, Erxl. There is a correspondence between the three; but the first two agree most closely in several particulars. In C. erythrogaster, as in them, the right lung has four lobes^ the left one only two, of which the upper lobe is deeply cleft. The heart presents nothing remarkable. The stomach is ovoid in figure, with the fundus bulging slightly upwards. There are no sacculations as in the genera Colobus and Semnopithecus. The oesophagus enters nearly midway between the cardiac and oesophageal ends. The transverse diameter from the fundus to the cardiac extremity measures 3£ inches-in a specimen of C. diana about the same age and size, 3^ inches-and in the Moustache Monkey (C. cephus), with a body greater in dimensions, only 3 inches. The opposite diameter, viz. from the oesophagus to |