490 EPOMors. 



straight line between fronts of canines, cutting- edges bilobed. 

 Upper canines thin, distinctly recurved, anterior surface of crown 

 perfectly smooth or with a scarcely detectable trace of a vertical 

 groove antero-internally ; cingulum narrow ; lower canines similar 

 to upper but shorter and slenderer, crown often (particularly in 

 E. dobsoni) slanted distinctly outward. Diastema c-p' wide, all 

 cheek-teeth spaced, p,, though small, with distinct remnants of 

 typical structure ; outer ridge raised as a small acutel)' pointed 

 cusp, p^ and Pg canine-like in profile, but outer and inner ridge 

 never so completely fused as to obliterate the median groove. 

 p^ m\ p^, and m, simple, narrow, with distinct median groove 

 and prominent lateral ridges, m^ generally about half the bulk 

 of ra,. 



Fig. 32. — A, liyoicl bones and muscles of Fpomops buettiJcoferi (enlarged), h.hy, 

 basihyal , th.hy, thyrobyals (shown diagrammatically, in their natural 

 position curved round the thyroid cartilage of the larynx); ccr.hy, 

 ceratobyals ; ep.hy, epihyals ; x, prominent articular process of 



^ epihyal, separating and acting as a pulley for the fleshy tendons of 



the mylohyoid {my.hy) and hyoglossus niuRcles ihy.yl) ; si.hy, tendon 

 of stylohyoid muscle attached to upper margin of epihyals. 

 B, sagittal section through larynx of Epomops buettiJcoferi (enlarged). 

 <•, epiglottis ; h.e, hyo-epiglottideus muscle ; h.h, basihyal ; ih.c, 

 thyroid cartilage ; u.v.c, upper vocal cord ; v, ventricle, leading 

 anteriorly into the long sacculus laryiigis, extending almost as far 

 as the base of the epiglottis, and posteriorly continued backward 

 behind l.v.c, the lower vocal cord ; s, apex of Santorinian cartilage ; 

 c, crescentic fibro-cartilagiuous cushion extending forward from 

 a.r, the arytenoid cartilage ; cr, cricoid cartilage. 



From P.Z. S. 1881, pp. 686, 6'JO (reduced and slightly altered). 



i^ absent on both sides, four have the teeth quite or nearly imworn ; the 

 tooth is sometimes absent on both sides even in slightly immature skulls. So 

 far as the available material goes, i^ appears to be much more frequently lost 

 in E. f. franqueti than in E. f. strepitans and in E. htiettikoferi. (For I'urther 

 details see Ann. & Mag. N. H. (8) v. pp. 103, 104; 1910.) -The single adult 

 individual examined of £". dohsoni has i'^ present on both sides. 



