769 



the nasals. The squamosals articulate with the frontals and very nearly reach the malars. 

 Traces of the suture connecting the costal appendages of the first sacral vertebra with its 

 body are still visible. 



Purchased. 



5084. The skeleton of a young Chimpanzee (Troglodytes niger). 



The deciduous teeth have been gained and the first true molars are just appearing through 

 the socket. The vertebral formula is : 7 cervical, 13 dorsal, 4 lumbar, and 7 sacro-caudal. 

 The last lumbar has its diapophyses much increased in breadth to aid in the articulation of 

 the vertebral column with the pelvis : in the adult it would probably have coalesced with the 

 sacrum and have reduced the lumbar series to three. The alveolar portion of the maxillo- 

 premaxillary suture is obliterated ; the nasal portion remains, and shows that the apices of 

 the premaxillaries articulate with the nasals. The coracoids are still unanchylosed to the true 

 scapulae. 



Mus. South. 



5085. The skeleton of a young Chimpanzee (Troglodytes niger). 



The deciduous teeth, except the canines and second upper milk-molars, have come into 

 place. The vertebral formula is : 7 cervical, 13 dorsal, 4 lumbar, and 8 sacro-caudal. The 

 diapophyses of the last lumbar are expanded and join the ilia. The first sacral is distin- 

 guished by that junction being effected by separate costal elements. The sutures of similar 

 elements may be discerned in the succeeding sacral vertebrae. The squamosals articulate with 

 the frontals, but by a smaller proportion than in the preceding skeleton. 



Mm. Brookes. 



5086. The cranium and portions of the lower jaw of an adult male Chimpanzee 



(Troglodytes niger). 



The mature dentition has been fully acquired and moderately worn. The maxillo-pre- 

 maxillary suture is obliterated, as are likewise most of the sutures of the cranium. The basi- 

 occipital and basisphenoid are confluent. The calvarium has been detached, and the section 

 shows the extension of the mastoid cells into the squamosal. The foramen ovale is entirely 

 circumscribed by the alisphenoid. The clinoid processes are well developed, and the poste- 

 rior clinoid plate is perforated. 



Presented by Captain Harris. 



The following, to No. 5170 inclusive, are parts of the same skeleton of an adult male 

 Chimpanzee (Troglodytes niger) : 



Purchased. 



5087. The skull. 



The roots of the teeth have been exposed on the right side of both jaws. The large 

 canines characteristic of the sex have been fully acquired, but the left last true molar has not 



5 F 



