18 EOrSETTUS. 



a little shorter than iu Eidolon; from front of orbit to tip of 

 nasals less than length of maxillary tooth-row (except in E. lanosus, 

 owing to reduction of cheek-teeth in this species), but much greater 

 than lachrymal width of skull ; front of orbit vertically above 

 middle or posterior half of m^ (cf. Myonycteris). Nasals not pro- 

 duced quite as far forward as front of premaxiUaries, Premaxil- 

 laries in perfect contact in front, in one species {R. angolensis) 

 co-08sified without any trace of the original suture. Postorbital 

 processes not reaching halfway between frontal and zygoma. 

 Sagittal crest low or undeveloped, the temporal ridges often remain- 

 ing separate throughout the life of the individual. 

 Other cranial characters as in EidoJon. 



,, i' i' c p' p' p^ m' m'' ^ o . 



Dentition (figs. 2-4 *),— Normally v-. 5— LJ X 2:= 34. 



^ iii.cp, P3P, m^m^m, 



p^ and m^, p, and m^ reduced ; p^ permanent in most species, 



deciduous in li. seniinudns and brachyotis. A minute m^ occasionally 



present on one side or both sides t. In one skull in the collection 



(R. anr/olcnsis, S ad. ; G.12.4.5) a small supernumerary molar 



(very broad, but excessively compressed antero-posteriorly) is 



present on the right side, closely wedged in between m' and m'^. 



Upper incisors equidistant, or i'-i' slightly more separated than 

 i^-i^. Upper canine and p' generally widely separated, sometimes 

 rather closely approximated (individually in R. ampler icaudatus 

 and, particularly, R. brachyotis), very rarely in actual contact 

 (occasionally in R. brachyotis when p' is wanting), p' much more 

 reduced than in Eidolon, being in cross section only equal to (or 

 smaller than) an upper incisor, in some species deciduous (R. s'^ml- 

 ■nudus, brachyotis). m^ much smaller than ra', but not reduced to 

 the same degree as in Eidolon. 



Lower incisors subequal in height and bulk, or the outer ones 

 slightly larger in cross section ; cutting-edge in youngish individuals 

 distinctly bifid ; the median notch of the cutting-edge continued 

 for a short distance down the front of the crown as a faint vertical 

 groove ; this groove is usually detectable even -when the cutting- 

 edge has been worn straight, p^ small, in most species from twice 

 to four times the bulk of a lower incisor, in one species {R. ango- 

 lensis) not, or scarcely, exceeding a lower incisor ; as a rule situated 

 nearer to the canine than to p^. m^ nearly always exceeding 

 (sometimes only equalling) p^ in length, but never quite as long as 

 m and m^ combined, m, smaller than, sometimes only half the 

 size of, m^. m^ much smaller than m.^, elliptical or subcircular in 

 outline. 



The molariform teeth, above and below, are uuusually narrow in 

 R. lanosus ; an approximation to this is found in R. celebensis. 



* Fig. 3 on p. 49, fig. 4 on p. 52. 



t Details from 88 skulls examined, representing all species known : — 

 m' present on one side : R. leacAi, cue adult, teeth well worn (37.4.28.67) ; 

 /?. aewimtdiis, one adult, teeth unwora (nut registered) ; m-* present on both 

 sidf s : R. (pgijptiacuii, one adult, teeth practically unworn (4.4.9.2). 



