27G 



PTEnOPrs MOI.OSSINUS. 



Blagnosis. — Easicranial axis more deflected than usual ; rostrum 

 short and broad ; sagittal crest none ; coronoid low and sloping. 

 Canines unusually heavy at base, crown much compressed laterally ; 

 upper cheek-teeth short, subsquarish ; m^, m^, and i^ much reduced ; 

 p, large. Ears small, almost concealed in the fur. Tibia naked. 

 Fur rather long, uniform vandyck-brown above and below (generally 

 sprinkled with a few whitish hairs), face paler. Size very small : 

 forearm 94-9S-5 mm. Hah. Caroline Is. 



Skull. — Brain-case high, domed ; basicranial axis much deflected, 

 alveolar line if continued backward passing through (or above) base 

 of zygomatic arch and some point near middle of supraoccipital. 

 Rostrum unusually short, stout ; front of orbit above front of m\ 

 Orbits small, diameter (8-7-9 mm.) less than Avidth of rostrum 

 across alveolar borders of p^-p^ (9-5-10 mm.). Base of postorbital 

 processes not, or only slightly, raised above level of frontal plateau, 

 tliis latter therefore flat or only very slightly concave ; postorbital 

 processes thin, reaching halfway or two-thirds the distance between 

 frontal and zygoma ; no lower postorbital processes (on zygoma). 

 Temporal fossa narrow; temporal crests in fully adults closely 

 approximated, but not united to form a sagittal crest. Coronoid 

 jirocess very lovv, much sloping ; condyle of mandible slightly 

 above alveolar line, this latter projected backward touching lower 

 margin of condyle. 



I'eetJi. — Chief characters : upper canines peculiar ; upper cheek- 

 teeth shorter (more squarish) than usual ; posterior ledges of 

 cheek-teeth obsolescent in upper, distinct in lower jaw; i, much 

 reduced, p^ large, m^ and m^ very small. 



Dpper canines extremely heavy at base, antero-posterior basal 

 diameter almost two-thirds of height of tooth from alveolar border ; 

 crown strongly compressed from side to side, hinder margin sharp, 

 trenchant; vertical groove on front face unusually deep; cingulum 

 strong, forming a sharply projecting ledge at lingual base of tooth, 

 p' small, deciduous, in cross section subequal to one-third or one- 

 fourth of an upper incisor, p'-m' shorter, but not much narrower 

 than usual. Posterior basal ledge of p' short, usually distinctly 

 differentiated from tooth ; in p^ and m' fairly distinct at postero- 

 internal corner of tooth, practically obliterated postero-externally. 

 ])^ subquadrate in outline, length of crown only slightly greater 

 than breadth. Sometimes a faint indication of an antero-internal 

 basal tubercle in p', p*, and ]),. m^ small, subcircular, equal in 

 cross section to an upper incisor. 



ij much reduced, in bulk from one-fourth to one-sixth of, in 

 vertical extent considerably lower than, i^. Lower canines heavy 

 at base, compressed laterally ; median vertical keel on lingual face 

 unusually high and sharply defined ; cingulum forming a broad 

 ledge at posterior base of tooth and terminating abruptly in front 

 as a minute cusp above the cutting-edge of i^. p^ large, equal to 

 ra^. Posterior ledge of p^, p^, and m^ distinctly marked off postero- 

 externally by a slight notch from base of outer main cusp (at least 

 in Pj and p^) ; the ledgo as a rule also traceable in m.^. m^ small, 

 subcircular, equal to or smaller than i,,. 



