FASCICULI MALATENSES 
103 
part of the bone is relatively of large extent, and is so protuberant that great 
outward convexity of the cerebellar lobes is indicated ; the condition recalls 
that in the Orang Laut skulls, described in a former part of this paper, and is 
made the more conspicuous by the fact that in both races a broad band-like 
depression runs transversely across the occiput, separating the two parts of the 
occipital bone. The angle formed by the plane of the squama and that of the 
nuchal plate is, especially in the young skull, far less wide than in the other 
Malayo-Siamese skulls described. The forehead is vertical in the four 
specimens, and the ridges in this region are feebly developed. The nasion is 
very little depressed, and the nasal bones are not prominent, being least so in 
the young skull. There is a slight subnasal prognathism in No, 25, in which 
the gnathic index is 100 ; Nos. 26 and 27 are practically orthognathous, their 
respective indices being 95 and 93’7. The young skull has a gnathic index of 
101‘i, chiefly due to a general protrusion of the face beyond the line of the 
forehead. The zygomata are moderately stout, but the mastoids are feebly 
developed, especially in No, 26, in which their condition is almost infantile. 
Their condition in the young skull is even more child-like than in most 
European specimens of the same age. In No, 25 the skull rests behind both 
on the posterior border of the foramen magnum and on the condyles, while in 
the remaining three specimens it rests only on the former point; hut in all 
cases the plane of the foramen approaches the horizontal. Except in No. 25, 
the height of the cranium is less than the breadth ; in No. 26 the vertical index 
is 77*6, and the height index 97*1 ; in No. 27 the vertical index is 78*3 and 
the height index 99*2 ; in No. 29 the two indices are respectively 76*4 and 
95-5 ; while in No, 25 they are 79*4 and 100*7. 
Norma facialis . 
The orbital index of the four specimens is mesoseme, varying from 85*7 
to 88*9 in the adult skulls. The nasal bones are rather wide in the female 
skulls, somewhat wider and flatter in the young specimen ; in the former the 
nasal aperture is cordiform, narrower in No. 26 than in the other two ; but in 
the young skull it is very short and approaches the square in shape. The nasal 
index of the adult skulls varies from platyrhine to leptorhine, being 56*8 in 
No. 25, 53*5 in No. 27, and 44*7 in No, 26 ; in No. 29 it is mesorhine, 51*1. 
The condition of the nasal floor in the adult specimens resembles that in No. 
23, while in the young specimen there is a definite outward and downward 
slope 1 at the point of junction with the jaw. The maxillo-facial index of two 
of the adult specimens (Nos. 25 and 27) is chamaeoprosopic, being 54*5 in one 
t. As in Hovorka’s Afftnnnnt (r,r. p. 38, fig. 9.V), rather than in hi* Firms infant Hit (fig, (jr). 
