SI MIA SYNDACTYLA. 
around the orbit, and forming a short tube surrounding the eye. The temporal- 
ridges on each side are very prominent, and run parallel to each other from the 
frontal-margin to the occiput, separated about one inch. The posterior part of 
the skull is terminated abruptly by a plain surface, which is bounded by a promi- 
nent ridge The teeth exhibit the following particulars : — In the upper jaw, the 
intermediate front teeth are short, broad, and subconvergent ; the next on each side 
is distant and narrower. The canine teeth stand separated from the other teeth, are 
very large at the base, and although in the specimen the points are broken off, they 
have the appearance of having projected far beyond the other teeth. There are two 
bicuspidati and three quadricuspidati on each side, having the general form of these 
teeth as well in the Simla Satyrus of Limueus, as in man ; their surfaces arc much 
worn by trituration. In the lower jaw the front teeth are disposed uniformly, 
with a small space between each ; here the two intermediate teeth are smallest, and 
they are generally narrower than the front teeth in the upper jaw, and much worn 
by trituration. The canine teeth greatly exceed the front teeth in length ; they 
tend obliquely outward, and have an additional projection or gradus at the base. 
The first grinder in the Siamang, as well as in several other Quadrumana from the 
Eastern Islands, has a character essentially different from the first bicuspidatus in 
man. It presents one high, acute, conical or pyramidal point, projecting consider- 
ably beyond the second bicuspidatus, with an oblique edge, corresponding to the 
canine tooth in the upper jaw, with a less prominent tubercle near the base. The 
second bicuspidatus has the same form as the corresponding tooth in the upper jaw; 
to this follow, on each side, three quadricuspidati, resembling those in the upper 
jaw, and equally worn on the surface by trituration. 
A comparison of the skeleton of a young subject of Simia syndactyla, lately 
obtained from Sumatra, and of an adult skeleton of Simia Lar, having been afforded 
to me by Joshua Brookes, Esq. at his Museum in Blenheim Street, with distin- 
guished liberality, I am enabled to add the following remarks in further illustration 
of the bony fabric of our animal. — The head in the Simia syndactyla is more rounded 
posteriorly ; it has an obovate form, and the orbital-margins and temporal ridges less 
developed. The canine teeth extend but slightly beyond the front teeth. Of 
three grinders, which are as yet apparent, the two posterior are quadricuspidati, 
with considerably projecting points; and the secondary front teeth present a serrated 
margin, as they do in man on their first appearance. The bones of the anterior 
extremities are proportionally longer than in Simia Lar, and extend beyond the 
malleolus quite to the ground ; the bones of the thumb are also more lengthened and 
slender. The skull of the adult Simia Lar agrees strikingly with that of the adult 
Simia syndactyla ; it has the same oblong form ; the orbital-margins, and the annular- 
