338 BIDELPHriDJB. 



back of the long external pad. Tail longer than head and body, its 

 furry part from two to three inches long, ending abruptly at the 

 same level all round; remainder absolutely naked, without any 

 minute hairs, very smooth, the scales scarcely perceptible ; its colour 

 duU grey proximally, white terminally, the two colours intergrading 

 by a series of coarse and prominent grey and white mottlings. 



Skull short and broad, with a short and conical muzzle and widely 

 expanded zygomata. Nasals much expanded behind. Interorbital 

 space broad, rather hoUowed in the centre, its edges square ; post- 

 orbital processes forming large flat triangular projections over the 

 orbits, the temporal ridges running backwards from their tips, but 

 not meeting to form a median crest. Palate almost perfect, a single 

 small pair of vacuities only present opposite m.^ Posterior nares 

 very wide and low. Lower jaw very high vertically, and very thin 

 transversely, its lower margin quite sharp-edged, and its angle 

 unusually slightly inflected. 



Teeth (PI. XXVII. flg. 1). Upper canines very long and straight, 

 scarcely curved at all, their length vertically about equal to that 

 of the three posterior molars taken together horizontally. P.' close 

 to the canine, minute, probably almost functionless, barely one tenth 

 the size of p." P.' decidedly smaller than p.^ Molars small and 

 rounded, decreasing in size backwards, the last about one quarter 

 the size of m.^ Lower p.' about one fifth the size of p.'', the latter 

 decidedly larger than p.* Molars as in the upper jaw, decreasing 

 backwards ; m.'' about two thirds the size of m.^ 



Dimensions. 



. <s- s- 



b (in spirit), g (in spirit). 



Adult. Adult, 



millim. millim. 



Head and body 245 290 



Tail 820 360 



Lower leg 56 58 



Hind foot 36 35-5 



Ear 23 29 



Muzzle to eye 22-5 25 



Skull, see p. 341. 



Hai. North-eastern South America (Guiana, Brazil). 

 Ti/^e not in existence. 



o. Ad. al., 5 . British Guiana. Purchased. 



*. Ad. al., (f. Surinam. E. Bartlett [C.]. 



c. Ad. al., 2 • Manaos, Brazil. A. Peixoto [O.J. 



J 1 Ad. sks. I J, Brazil. Purchased. 



^'^- 1 Skulls. [ <^- 



/. Ad. sk., 2 . Brazil. Zool. Soc. 



jr-/. Ad. 2 , imm. & yg. al. ' Lidthde JeudeColl. 



TO. Skeleton, 2 ■ . Lidthde JeudeColl. 

 n. Ad. al., S . (Besorihed by Waterhouae.) 



0. Imm. St. Lord Derby [P.], 



