1865. ] AXIAL SKELETON IN THE PRIMATES. 567 
The Ape which appears to approach Man most closely in the pro- 
portions of its sternum is Hylobates lar*. 
In Troglodytes the body of the sternum remains, in the adult, 
more or less divided—sometimes, as in the skeleton of the large Go- 
rilla in the British Museum, the manubrium anchylosing with the 
first bone of the body of the sternum, while its posterior component 
bones remain still distinct. The sternum of 7. gorilla is much 
broader than that of 7. niger. 
In Stmia the body of the sternum is at first divided in a singular 
but varying manner, which is well known, and has been often 
noticed F. 
The manubrium has its anterior margin greatly thickened in 
Simia, Man, Cynocephalus, and the Siamang. 
In Indris its anterior margin is prolonged downwards in a peculiar 
manner. In Lemur this part is sometimes narrow, pointed, and 
produced tf. 
In Chrysothrix the manubrium has a strong process standing out 
on each side, and serving for the attachment of the first rib. 
In a specimen of Mycetes preserved in the British Museum 
(no. 44a) the manubrium is completely divided in the middle line, 
Fig. 5. 
Anterior part of sternum of Mycetes. Nat. size. m. Divided manubrium. 
Fig. 4. Specimen in the British Museum. 
5. Specimen in the Museum of the Royal College of Surgeons. 
each half supporting a clavicle and first rib§. It is also completely 
divided in the specimen in the Museum of the College of Surgeons. 
* No. 5027 in the Museum of the Royal College of Surgeons. 
t Owen, Trans. Zool. Soe. vol. i. p. 363, and Osteological Catalogue, vol. ii. 
pp. 763 & 765, nos. 5058 & 5071; Vrolik, Recherches d’Anat. Comp. sur le 
Chimpansé, p. 11; De Blainville, Ostéog. Primates, Pithecus, i. p. 30. ° 
{ Eg. in no. 5027 in the Museum of the Royal College of Surgeons. Vrolik 
says (/. c. p. 12) that in the Mongous the manubrium quite disappears. I have 
not observed this. 
§ De Blainville says, “Le manubrium parait plus profondément bifurqué en 
avant que chez les autres Sapajous” (1. c. Cebus, p. 16). 
