77 
and caudal; seven rows above the lateral line anteriorly, and fourteen 
below it. 
The scales are oblong, with parallel or converging sides, a truncated 
or rounded base and a rounded or conical free end. Fine strize, from 
twelve to twenty in number, diverge from the centre towards the base, 
but do not produce lobes or crenatures on the margin ; there are some 
fainter diverging strize anteriorly. The lateral line is arched over the 
pectoral, and afterwards descends gradually, till opposite the three 
last dorsal spines, from whence it holds a straight course down the 
middle of the tail and runs out to the middle of the caudal membrane. 
It is formed of a series of single straight tubes, and is nearly perfectly 
continuous, especially posteriorly. 
The dorsal spines are slender, and end in soft flexible tips. The 
first spine stands over the base of the lowest pectoral ray, and is the 
tallest*; the others gradually diminish in height to the penultimate 
one, which is a little shorter than the last one ; the soft rays are forked, 
and rise abruptly to nearly twice the height of the posterior spines. 
The anal, of similar height and shape to the soft dorsal, has its com- 
mencement and end a little posterior to those of the latter. The 
rather small ventrals are attached opposite to the third dorsal spine. 
The caudal is rather large, and is crescentic at the end with project- 
ing points, of which the upper one is the longest. 
In general colour the fish appears from Mr. Neill’s figure to be 
blackish-green, deepening nearly to black on the back and dorsal fin. 
A deep prussian-blue streak covers the second pectoral ray, and there 
are two broader, interrupted ones on the caudal, viz. between the 
longest rays of the caudal above and below and the ray immediately 
interior to them. The iris is likewise blue, and there is a blue spot 
on the nostrils. These streaks are to be traced on the specimen, but 
have changed to green. The female differs in being much paler (a 
dull leek-green in the dried specimen), and in wanting the blue streaks. 
The lobes of its caudal also are less prolonged. 
9. DESCRIPTION OF A NEW SPECIES OF MONKEY, RECENTLY 
LIVING IN THE SocteTy’s MenaGERIE. By JoHn Epwarp 
Gray, Esa., F.R.S. etc. 
(Mammalia, Pl. XVI.) 
PRESBYTIS ALBIGENA. Grey-cheeked Presbytis. 
Black ; throat, sides of the neck and front of the chest greyish ; 
face black, nearly bald, with a few short, rigid, black hairs on the 
lips; a tuft of elongated rigid hairs over each eye ; the cheeks are 
covered with short, adpressed, greyish hairs. The hairs of the body 
are uniform black to the base, rather elongated and flaccid, forming 
a fringe along each side, and a compressed crest on the crown and 
* The artist has inadvertently drawn the first dorsal ray a little shorter than 
the second one, not having noticed that its tip was bent backwards in the speci- 
men put into his hands. 
