781 



5165. The right fifth metatarsal. 



The proximal end is larger than in the Orang-utan. 



5166. The metatarsal of the left hallux. 



5167. The left second metatarsal. 5168. The left third metatarsal. 

 5169. The left fourth metatarsal. 5170. The left fifth metatarsal. 



5171. The skull, with the deciduous dentition, of a young Chimpanzee (Troglodytes 

 niger). 



The alveolar portion of the maxillo-premaxillary suture is obliterated, but the palatal and 

 nasal portions remain. The apices of the premaxillaries in this instance do not reach the 

 nasals. The squamosals articulate with the frontals. The elements of the occipital are still 

 distinct. In a Human skull with a corresponding stage of dentition the exoccipitals have 

 become confluent with the superoccipital, but not with the basioccipital, and only a small 

 portion of the palatal part of the maxillo-premaxillary suture remains. 



This is the specimen alluded to by Mr. Lawrence when treating of the intermaxillary bone, 

 in the fourth chapter of his " Lectures on the Natural History of Man," 8vo, 1819, p. 1/4. 



Presented by the Rt. Hon. Earl Spencer. 



The following, to No. 5177 inclusive, are parts of the same skeleton of a young Chim- 

 panzee (Troglodytes niger) : 



Purchased. 



5172. The skull. 



The deciduous teeth are retained and the first permanent molar has been acquired. The 

 palatal and nasal portions of the maxillo-premaxillary sutures remain and show the apices of 

 the premaxillaries articulating with the nasals. The elements of the occipital are still uuan- 

 chylosed. The squamosals articulate with the frontals. The calvarium has been detached. 

 There is no cerebellar fossa in the petrosal. The foramen ovale is not quite circumscribed by 

 the alisphenoid. The germ of the large permanent median incisor is exposed on one side of 

 both upper and lower jaws. 



5173. The bones of the trunk, with the scapular and pelvic arches. 



The vertebral formula is : 7 cervical, 1 3 dorsal, 4 lumbar, and 7 sacro-caudal. The first 

 three sacrals articulate with the ilia, as does also the last lumbar by means of a thickened 

 diapophysis. 



