20 ALLEN’S NATURALIST’S LIBRARY. 
The Tarsiers have nineteen dorsal and lumbar vertebre 
tozether, and twenty-seven in the tail. The humerus presents 
a perforation (the entepicondylar foramen) at its lower inner 
side, and another nearly in the centre above the hinge. The 
femur is more than twice the length of the arm-bone; the 
lower half of the slender fibula is co-ossified with the tibia, 
while two of the tarsal, or ankle-bones (the cadaneum and 
navicudare), are remarkably elongated, thus giving to the hind- 
limb of these animals the singular conformation from which 
they derive their name. ‘The large intestine is not convoluted 
upon itself as in so many of the Lemurs, nor is there a cecum 
at the junction of its smaller and larger portions. 
I, THE SPECTRAL TARSIER. TARSIUS TARSIUS. 
Lemur tarsius, Erxl., Syst. Regn. Anim., Mamm., p. 71 (1777). 
Tarsius spectrum, Gcoffr., Ann. Mus., xix., p. 168 (1812) ; 
Dahlb., Studia, p. 231, tab. 11. 
Lemur spectrum, Pallas, Nova Sp. Glir. Ord., p. 275, note 
(1778). 
(Plate IT.) 
Characters—On the upper lip, sides of nostrils, and over 
the eyes long, delicate black hairs (wdriss@) ; hair on nose 
very short, longer in front of ears and at angles of mouth. 
Fur of body generally thick, woolly, the basal two thirds slate- 
grey, the terminal third brownish-yellow. Face to forehead 
fawn-brown, somewhat darker around and between the enor- 
mous liquid brown eyes. ‘Top and back of head and shoulders 
cfa more uniform and darker shade; rest of back apparently 
mottled, owing to the light-tipped hairs of that region gather- 
ing into locks. Under side of body, inside of arms and legs 
paler. Tail dirker brown, rufous at base of upper side. Size 
not exceeding that of a small Rat. 
