24 
on the hinder part of the middle of the zygomatic arch, while the 
Ptilocercus has only a small round perforation in the front part of 
the middle of the same part, which is probably the analogue of the 
hole in the former genus. 
PTILOCERCUS, 0. g. 
Head moderately tapering ; whiskers elongated, rather rigid. Ears 
moderate, naked, exposed. Body slender, fur soft. Limbs moderately 
elongated, nearly equal. Toes 5°5, rather compressed, free. ‘Thumb 
moderate, like the toes, but shorter. Claws short, compressed, tri- 
angular, acute. Tail elongate, cylindrical, hairy quite at the base, then 
naked, covered with rings of square, broad, adpressed scales and short 
scattered hairs, and the hinder third with a series of elongate hairs, 
forming a barb on each side. Skull conical; face rather short. 
Cutting teeth } ; 
shelving, front pair conical, small, shorter than the middle pair, 
which are elongate, curved, acute; the hinder smallest and shortest. 
Canines none. Grinders i, the front 3.3 in each jaw, small; 
the hinder 4 . 4 large, square, acutely tubercular. 
The skull is shorter, broader, and the face less elongated than that 
of the different species of Tupaia, and it differs from them in the two 
front teeth of the lower jaw being smaller and shorter than the suc- 
ceeding one, while in all the species of Tupaia (including the genus 
Dendrogale) figured by Temminck, the four front teeth of the lower 
jaw are equally elongated. 
The hinder cutting tooth in the upper jaw is placed on the suture 
of the intermaxillary (and hence may be a true canine) and not in 
front of the suture of the intermaxillary, as is the case with the skull 
of Tupaia tana and T. ferruginea in the British Museum collection. 
: i) upper elongate, far apart, rather curved; lower 
Prinocercus Low1!. 
Blackish-brown, very minutely grizzled with the yellowish tips of 
the hairs ; lips, lower part of cheeks, chin, and beneath yellowish: 
sides of the face inclosing the eyes black. Tail black ; barbs white, 
except a few hairs near the scaly part, which are black. 
Length, 53 inches; tail, 6}; hind-foot, 1. Skull: length, 1" 4"; 
tooth lie 7, of ae 5''; of zygomatic arch, 72'"; width at zy- 
gomatic ae 93'"; at temples, 63'"; between foe ly 33!" 
Inhab. Borneo, Sarawak. 
I have named this species after my friend Mr. Hugh Low, who 
has much enriched our knowledge of the natural productions of 
Borneo. 
3. On THE Hasits or AMEIVA DorSALIS. By P. H. Gossz. 
This species is one of the most common of the reptiles of Jamaica, 
and is as beautiful as abundant. Its colours are striking, but not 
showy; its countenance has a very meek expression, not altogether 
unlike that of a deer or antelope. All its motions are elegant and 
sprightly ; when it is proceeding deliberately, its body is thrown into 
