724 



Genus Callithrix. 



nil/* l 2 2 1 1 



Dental formula : i , c , 



3 3 



4666. The skeleton of a male Marmoset, or Squirrel-Monkey (Callithrix sciiireus). 



The vertebral formula is :7 cervical, 13 dorsal, 7 lumbar, 3 sacral, and 24 caudal. The 

 transverse process of the atlas is perforated lengthwise and vertically by the vertebral artery, 

 which afterwards pierces the neural arch : those of the fourth to the sixth cervicals inclu- 

 sive bifurcate, the pleurapophysial portion increasing in breadth and length to the sixth : 

 the transverse process of the seventh cervical consists of the diapophysis only and is imper- 

 forate. The tubercle above the diapophysis divides into met- and an-apophyses upon the 

 ninth dorsal vertebra ; in the tenth these processes diverge ; they become quite distinct in the 

 eleventh, and increase in length to the fifth lumbar vertebra. The anapophysis is suppressed 

 in the last lumbar. There is a ridge upon the angle of the coracoid. The humerus is pierced 

 above the inner condyle. The pollex is partially opposed in the hand, and the corresponding 

 digit forms a more complete thumb in the foot. 



Mus. Brookes. 



4667. The skeleton of a female Marmoset (Callithrix sdureus). 



The sacrum is broader, especially at the third vertebra. 



Presented by Henry Cline, Esq. 



4668. An imperfect skeleton of the Marmoset (Callithrix sdureus). 





 A pair of hypapophyses is developed from the fore part of the sixth and succeeding caudal 



vertebrae as far as the sixteenth, beyond which they are represented by a single tubercle. 

 Hsemapophyses are articulated to most of these inferior processes, and form a complete arch 

 towards the base of the tail. 



Mus. South. 



4669. The skull of a Marmoset (Callithrix sdureus}. 



It shows the complete dental formula on the left side, which, agreeing in number and 

 kind with that of the Lemur, well illustrates the true homology of the inferior procumbent 

 canines in that genus. The orbits do not communicate with the temporal fossee. There are 

 no parapophyses, and only a feeble mastoid ridge. The petrosals are slightly swollen. The 

 superoccipital has two large depressions. The parietals articulate with the malars. There 

 is a postglenoid venous foramen. 



Purchased. 



