1025 
the floor of the nose. The more or less direct continuity of this floor 
into the incisive region, which is frequently found in Australian 
skulls, is a perfect one in Homo wadjakensis; from the outer edge 
of the nasal aperture a linear elevation continues on to the latter 
region, curved downward and inward, which is lost at 6 mm. below 
the nasal floor. This is a transition form between the infantile type 
of the lower edge of the nasal aperture and the suleus prae- 
nasalis of the Anthropoids, which may be designated as ‘Affen- 
rinne’, and which is undoubtedly in connection with the strong 
alveolar prognathism of Homo wadjakensis *). The other prognathism, 
which is indicated by the relative lengths of the basi-alveolar and 
basi-nasal lines, Frower's ‘“gnathic index”, which he found to be 
103,6 on an average in Australian skulls, while Turner met with 
a (female) minimum of 92, and a (male) maximum of 108, cannot 
be accurately determined in Wadjak I; it can, however, be indi- 
cated by the index 91 approximatively. The smallness of this index 
strengthens me again in the conviction that the first found fossil 
skull must be considered as female. The alveolar prognathism (Fig. 1. 
Norma lateralis of Wadjak [ and Fig. 4. Upper and lower jaw of 
Wadjak II) is not slight. 
A character which peculiarly distinguishes Homo wadjakensis is 
the extraordinary great breadth of the dental arcade in the upper 
jaw, compared with its length. (Fig. 6). The maximum width between 
the outer edges of the crowns of the 2°¢ upper molar teeth is 81 mm. 
for Wadjak I], 71 mm. for Wadjak 1. The length of the row of 
five molars, Frower’s “dental length’, is only 50 mm. at the male 
skull, and 47 mm. at the female skull. In Australian skulls TURNER *) 
found as maximum of width on the second upper molars 73 mm., 
as maximum of dental length 51 mm. In the fossil Wadjak men 
the breadths are to the lengths as 1.62 and 1.51:1. The palato- 
maxillary breadth agrees about with the greatest breadth over the 
molars. It is 82 mm. in Wadjak Il, and 70 mm. in Wadjak. I. 
These breadths are to the dental lengths as 1.64:1 and 1.49.1. 
Duckwortn determined the average of the palato-maxillary breadths 
of eleven male Australian skulls at 64.9 mm., and the mean dental 
length at 46.4 mm.; these dimensions are to each other as 1.40:1. 
1) Cf. for these forms of the lower edge of the apertura piriformis: Ruporr 
Martin, Lehrbuch der Anthropologie. Jena 1914, p. 845 el seq. 
2) Sir Wittiam Turner, The Relation of the Dental Arcades in the Crania of 
Australian Aborigines. Journal of Anatomy and Physiology. Vol. 25. (1891), 
p. 461—472. P. Aprorr (Das Gebiss des Menschen und der Anthropomorphen, p. 28. 
Berlin 1908) found for this dimension on the maxilla of a Melanesian 75.5 mm. 
