114 
D.J. Kitchener, A. Suyanto 
Figure 1 Map showing the locality of Riama Island and the Tanimbar groups of islands. 
interorbital region; M 1 and M 2 with well developed 
posterior cingulum with central vestigial cusplet; 
unreduced M 3 ; and long incisive foramen. 
Description 
Measurements of skull, dentition and externals 
are presented in Table 1. 
Skull (Figure 2) 
Skull small: greatest skull length 31.2-34.0 and 
zygomatic width 16.2-16.3, with a narrow rostrum. 
Skull dorsal profile sharply curved from nasal 
distal tip to anterior part of frontal when it slopes 
gently downward to mid parietal region and then 
more sharply downwards to the posteriormost 
edge of skull; interparietal wide (8.8—9.1); parietal 
moderately inflated; frontal anterior part forms a 
slight median sulcus that reaches to posterior one- 
quarter of nasal; nasal moderately long (11.3-12.3), 
constricted proximally and flared to a breadth of 
3.8-4.2 distally; anterior edge of premaxilla flange 
projected dorsally above incisor, almost vertical or 
slightly convex leading edge - nasal projects to a 
point approximately above or slightly anterior to 
this leading edge; zygomatic arch moderately 
thickened; zygomatic plate broad (4.3-4.9), 
anterodorsal part of leading edge projects furthest 
anteriorly from which point it curves gently 
posteriorly; infraorbital fissure moderately wide; 
lachrymal bones elongate, project only slightly 
outside curve of orbit edge; postsquamosal hook 
well developed, forms a slight vertical ridge with 
lateral occipital and mastoid - this ridge does not 
progress to interparietal posterior margin; 
