733 



and vertically by the vertebral artery which afterwards pierces the neural arch : the neural 

 spine is represented by a small tubercle, and there is a hypapophysial ridge. The centrum 

 of the axis is much produced backwards, underlapping that of the third vertebra : this 

 character is gradually lost in the succeeding vertebrae : the transverse process of the axis 

 ends in two tubercles. The lower (pleurapophysial) division of the process is compressed in 

 the third cervical and becomes developed into a plate, progressively increasing, and dispro- 

 portionately so in the sixth cervical : it is absent in the seventh cervical, the transverse pro- 

 cess of which is, however, still perforated by the vertebral artery. The neural spines are 

 simple, and increase in length from the third to the seventh cervicals. Those of the dorsal 

 vertebrae are longer and stronger, but diminish in length as they approach the loins. An 

 anapophysial tubercle is developed from the diapophysis of each dorsal vertebra, increasing 

 in length to the two last, in which it has an independent origin. The metapophysis is sud- 

 denly developed from the tenth dorsal, and presents an articular surface to a second facet on 

 the outer side of the hinder zygapophysis of the vertebra in front. The auapophyses con- 

 tinue to be developed from all the lumbar vertebrae, progressively decreasing as these 

 approach the sacrum, and appearing in the last as a mere ridge on the upper part of the 

 base of the diapophysis. The homotypal ridge may be recognized on the first sacral ver- 

 tebra. There are rudiments of hypapophyses on the middle caudal vertebras. Seven pairs 

 of ribs articulate directly with the sternum, which consists of seven bones and an ensiform 

 cartilage. The coracoid has an angular ridge, but is much less developed than hi the Platy- 

 rhine, or New-World Monkeys. The humerus is imperforate at its distal extremity. The 

 scaphoid is divided in the carpus. There is an accessory ossicle between the cuboid and fifth 

 metatarsal. 



Mm. Brookes. 



4720. The skeleton of a Mandrill (Papio Mormon). 



The vertebral formula is : 7 cervical, 12 dorsal, 6 lumbar, and 3 sacral : the caudal series 

 is incomplete. Rudiments of metapophyses are present on four of the dorsal vertebrae ante- 

 rior to the eleventh, in which the development of the metapophysis is suddenly increased with 

 the articular surface for the posterior zygapophysis on the tenth dorsal. 



Purchased. 



47:21. The skull of a young Mandrill (Papio Mormon j. 



The last true molars and the upper canines have not come into place. The crown of the 

 left upper canine is exposed. 



Hunterian. 

 47'2~. The skull of a young female Drill (Papio Anubis). 



It shows the sexual inferiority in the size of the canines. The teeth have been removed 

 from the right side of both upper and lower jaws, and are separately displayed. The lower 

 canines and premolars have cut the gum ; those of the upper jaw are still concealed in the 

 substance of the bone. The last true molars are concealed in both jaws. 



Hunterian. 



