KEY TO OtKEKA. 



a'. SurCace cusps in in and ui] (third 

 and fourth lower cheek-tooth; ; upjier 



canines grooved I'tciK/vhlrus, p. 613. 



b^. Ko surlaco cusps in check-'tteth ; 



upper canines without groove Meyarops, p. 154(3. 



t". Post orbital foraiuen absent J:'entl(etvr, i>. Wo, 



b'. Two pairs of lower incisors. 



C-. ihm pair of upper incisors Boneia, p. 55. 



rf-. Two pairs of upper incisors (outer pair often 

 deciduous in Mpuniops). 

 £••*. o upper cheek-teeth on each side (anterior 

 tootii otteu deciduous in i'tempus and 

 Acerodon). 



c^. A short bony auditory meatus Eiilvlvii, p. -. 



d''. No bony auditory uieatus. 

 e^. Occiput elongate, subtubular. 



c^. Outer lower incisor not more (but 



g."nprally less) than six times the 



bulk of inner. 



c'. No well-defined an tero - internal 



tubercle in p'' and in' (third and 



fourth upper cheek'tootli) Fttni^nis,}'. t'A, 



d'. A well -defined antero - internal 



tubercle in p^- and m' Arcrodmi, y, 112. 



d''. Outer lower incisor twelve to fifteen 



times the bulk of inner I'fcralDpe.v., \u Sni'2, 



f''. Occiput not elongate. 



«'". Length of rostrum (orbit to tip yf 

 nasals) subequal to lachrymal breadth 

 (across lower edges of lachrymal 



foramina) M,ijouijCtel-is, \^. o~G, 



f'\ Length of rostrum conspicuously greattr 

 than lachrymal breadth. 

 €•. Outer lower incisor much higher than ; p. 771. 



inner .Svco/(//;-<c'c/s Ipt.i, 



/"'". Lower incisors subeciual in height. , ,, ,, .> ,,. 



rt", Clieek-teetli not linear •< -,, , -^ -.,^, 



6». Cheek-teeth linear. ^ di..M,jjru ■,■!>> ■ , p. /.s. 



«". Premaxilla' much broader in 



upper than in lower half IiUhnij/vtcris, p. 7tio. 



6''. Premaxilhe not broader above 

 than below, 

 a'". Lower incisors subeiiually 



spaced ?Jt;/'iln'//iiti!ii(s, p. 738. 



b'". Inner pair of lower iiici?ors 



widely spaced Maci-Kiilosiua. p. 7J<'. 



,/"''. \jes> than o upper cheek-teeth on each side. 

 (,-■'. 4 upper cheek-teeth on each side. 



ij". t) lower cheek-teeth on each side I'Urtitci-, ji. 483. 



h^. o lower cheek-teeth on each side. 



/)''. Postorbital foramen (through base of 

 postorbital process) large. 

 J'. Rostrum short, scarcely deflected ; 

 inner secondary cusp in u)iper 



canines ('j/uujjffru.':. \i, oS<^. 



h'. liostrum long, strongly deflected ; no 



secondary cusp in canines Hijconi/ctci-is (jit.). p. 771. 



Ifi. Postorbital foramen absent. 



/''. Incisors proclivous, highly differ- 

 entiated, triangularly pointed Sphferias, p. 671. 



* As pointed out elsewhere (p. 733), it would be difficult to give any reliable (and 

 practically useful) cranial or dental character by w hich Euui/ctefis spelcea and iiicijnr 

 (K. ronfiiherrfi differs by the loss of m:i) can be discriminated from cnij/ s])ecies uf 

 lioHsetlns. although these two genera belong tc difleicnt .subhimilies. Externally 

 they are easily distinguished {Suusetlus with. Eonj/clcris without, claw in second 

 finecr). 



