5f? EONEIA. 



perfectly Rousetlinc. In liouscltus tlic breadth of the pnlat.e 

 ( palatal plates of niaxilhe) anteriorly between the cingnla of the 

 canines is lews than, or at most equal to, half the breadth between 

 m'^-ra-, the maxillary tooth-rows therefore very conspicuously con- 

 verging in postero-anterior direction, and the rostrum, in ujiper 

 view, distinctly tapering anteriorly, the breadth across the outer 

 surfaces of the canines being much less than the lachrymal breadth. 

 In Boneia the palatal breadth between the cingula of the canines 

 is about two-thirds the breadth between m"-m", the maxillary 

 tooth-rows not conspicuously converging postero-anteriorly, the 

 rostrum in u])per view, owing both to the greater distance between 

 the canines and to the unusually heavy sockets of these teeth, not 

 distinctly tapering anteriorly, the breadth across the outer surfaces 

 of the canines subequal to the lachrymal breadth. Premaxilla? 

 separated anteriorly by a space of about 1 mm. 



Deflection of brain-case greater than in typical Rovsettus, nearly 

 as in Steiionycteris {liousettvs lunosus, p. 49, fig. '•'>), alveolar lino 

 if projected backward passing through supraoccipital near upjier 

 margin of foramen magnum. Occiput not tubular (comparo 

 Ptn-opus). Length of rostrum much greater than lachrymal 

 breadth ; front of orbit above middle of m'. Palate, apart from 

 greater breadth iu front, quite as in Mmtsetfus, postdental portion 

 not long as in Pteropus. Premaxilhe perfectly similar in shape to 

 those of Eidolon and Roiiseitus, narrow, u])per extremity curved 

 forward and tapering to a point. Tympanic unknown. Sagittal 

 crest low, scarcely raised above level of brain-case ; postorbital 

 processes as in llousettus. Coronoid low, much sloping, rather 

 similar to that of Stenonycteris, though still lower and somewhat 

 broader antero-posteriorly ; condyle of mandible below level of 

 alveolar line. 



Dentition (fig. S).-.-!--^!'-^^-'"'— x2 = 32. p' and m=, 

 i^i,cp,p3p,m, m,m3 



Pj and 51)3 reduced. Dilferential characters, as compared with den- 

 tition of liovsetfus, see diagnosis of genus, siiprci. 



i^ small, subterete, crown very slightly differentiated from shaft, 

 cutting-edge rounded off; premasilla projecting on inner side of i'^ 

 (see fig. 5), suggesting the possibility that a rudimentary i' may be 

 present in young individuals, i^ similar in size and shape to i"; 

 i„ scarcely differing in general shape, but higher and considerably 

 larger, crown area twice or twice and a half that of i^. Upper 

 canine long, very broad f antero-posteriorly) at base, compressed 

 from side to side, its socket conspicuously projecting on side of 

 rostrum ; anteroposterior basal diameter subequal to length of ji' 

 (in 7^o«'4W^?/.s about two-thirds the length of p''); profile of front 

 margin of crown straight ; anterior surface of crown marked with 

 a broad and deep vertical groove : a similar deep but narrow 

 vertical groove on hinder surface of crown ; cingulum narrow. 

 Lower canine very heavy at base, crown slanted strongly outward. 



