500 ANNUAL REPORT SMITHSONIAN INSTITUTION, 1930 



From 1923 to 1926 tliore were recovered two human teeth from 

 material that had been previously taken from the Chou Kou Tien 

 deposit — a rip:ht upper molar and a lower first premolar. In October 

 of the following year Doctor Bohlin found a left lower permanent 

 molar (probably the first) of a child. 



During the season of 1928 there were found in the same deposit 

 (Locus A) tlie right horizontal ramus of an adult human lower 

 jaw with three molar teeth in situ and leaving the premolar, canine, 

 and distal half of the lateral incisor soclcets preserved; a some- 

 what worn right upper molar (M 1 or M 2) showing definite evi- 

 dence of injury during life; the labial side of the crown and 

 portion of the root of a permanent upper median incisor and imma- 

 ture lower (?) permanent incisor; and lastly the labial half of the 

 crown and root of a worn lower median permanent incisor, post- 

 humously crushed and deformed. The specimens are deeply pig- 

 mented and mineralized in a manner characteristic of all fossils 

 recovered from locus A. 



The fossils from Locus B of the same Chou Kou Tien deposit 

 are not deeply pigmented, most of them being quite white or of 

 light buff color. They are imbedded in a hard yellowish travertine. 

 Not much of the hominid material has as yet been disengaged from 

 the travertine matrix, enough, however, to prove that the hominid 

 material from both loci belong to the same genus and species, to 

 which Dr. Davidson Black has given the name Sinanthropus 'pekin- 

 ensis. The specimens thus far disengaged include a score or more 

 of both deciduous and permanent teeth representing many phases of 

 wear and age, together with complete symphysis region of the lower 

 jaw of a very young individual; other specimens are alreadjT^ visible 

 in the matrix. 



In December, 1929, while excavating a sheltered recess of the 

 main deposit at Chou Kou Tien, Mr. W. C. Pei discovered the 

 greater part of an adult hominid cranium in a good state of preser- 

 vation (not even crushed). Within the main cave deposit at Chou 

 Kou Tien up to the present time Sinanthropus remains have been 

 recovered from five different loci, three of which, including the 

 last major find, have been discovered by Mr. Pei during the last 

 season's work. Contrary to any reports Mdiich have been circulated, 

 no skeletal parts other than the skull and numerous isolated teeth 

 have been recovered during the past year's excavations. 



It should be noted that the different Sinanthropus loci discovered 

 within the main Chou Kou Tien deposit are all clearly contempo- 

 raneous with one another, being Lower Quaternary (Polycene) in 

 age. This latter statement is based on the evidence collected in a 

 preliminary report on the geology and paleontology of the site by 



