741 



4826. The skeleton of the Pig-tailed Baboon (Macacus nemestrinus). 



The vertebral formula is : 7 cervical, 1 2 dorsal, 7 lumbar, 3 sacral, and 1 7 caudal. The 

 atlas has a strong hypapophysis, but no neural spine or tubercle : the transverse process is 

 perforated obliquely. The back part of the centrum of the axis is much produced ; that of 

 the third cervical is less produced. The spine of the axis is long and bent backwards. A 

 pleurapophysial plate extends obliquely from the transverse processes of the third, fourth and 

 fifth cervicals, and projects downwards and outwards as a distinct broad plate from that of 

 the sixth vertebra. The long and simple transverse process of the seventh is not perforated 

 by the vertebral artery. Metapophysial tubercles are developed upon the diapophyses of the 

 second and succeeding dorsal vertebrae, increasing in distinctness and size to the tenth : in 

 the eleventh the anapophyses become separate processes, and the metapophyses develope a 

 facet for the accessory articular surface of the posterior zygapophysis of the tenth vertebra. 

 This additional interlocking is continued to the antepenultimate lumbar, the joint being 

 further strengthened by the underlapping of the long anapophyses : these disappear in the 

 last lumbar. The diapophysis is a mdimental ridge in the last dorsal, but becomes a distinct 

 depressed sharp plate in the first lumbar, and progressively increases in size with an antro- 

 verted direction in the succeeding lumbar vertebrae. Eight pairs of ribs articulate directly 

 with the sternum, which consists of eight bones and an ensiform cartilage. The short and 

 broad coracoid has an angular tuberosity. The distal end of the humerus is imperforate. 

 The scaphoid is divided, and there is an accessory ossicle between its outer division and the 

 trapezium. The fabellae are preserved, one behind each condyle of the right femur. There 

 is an accessory ossicle of the tarsus between the cuboid and fifth metatarsal. The right ilium 

 shows repair of injury by disease. The ischia expand into rough flattened tuberosities. 



Mus. Brookes. 



4827. The skull of the Pig-tailed Baboon (Macacos nemestrinw). 



Portions of the frontal and parietal bones have been removed by ulceration. The alisphe- 

 noid joins the parietal on the right side, and is separated by a very short fronto-squamosal 

 suture on the left. The mature dentition is acquired. The fifth, or supplemental lobe of 

 the last molar is comparatively small in this species. 



Presented by Dr. Henderson. 



4828. The skull of the Macacus nemestrinm, with the entire dentition. Hunterian. 



The following, to No. 4853 inclusive, are parts of the same skeleton of a Macacus, of the 

 size of M . nemestrinus : 



Hunterian. 



4829. The cranium, with the calvarium detached. 



A process of a styliform shape is developed from the lower end of each mastoid. The 

 posterior clinoid plate is largely developed and is perforated. The cerebellar fossa is mode- 

 rately deep ; the foramen ovale is between the alisphenoid and petrosal. The entry to the 

 rhinencephalic fossa is contracted by a pair of lateral processes. 



