Key to Plate of Skulls of Mammals 569 



Fig. 2. Skull of a Sloth (Brady pus caculliger), two-thirds 

 size. — The molar teeth are separate one from another, and 

 are round. The nose and front face have the appearance of 

 having been cut off (truncated). 



Fig. 3. Skull of Hedgehog (Evinaceus euro pens). — The 

 Hedgehog is a good type of the Insectivora. The teeth are 

 almost always different in the two jaws. Note that there is 

 no trace of boundary of the orbit behind. 



Fig. 4. Skull of Lynx (Felis caracal), one-half size. — This 

 skull may be compared with that of a common cat, and is a 

 good type of the feline branch of Carnivora. Note the large 

 canine teeth, the carnassial molars, the orbital rim open 

 behind, and the large auditory bulla. 



Fig. 5. Front End of the Lower Jaw of the Colugo or 

 Flying Lemur (Galeopithecus variegatus). — It is seen from 

 above, in order to show the comb-like notching of the incisor 

 teeth. The Galeopithecus constitutes an order by itself, and 

 stands between the Bats and the Lemurs. These pectinated 

 teeth are peculiar to this animal, or are approached only in 

 certain Bats. 



Fig. 6, a and b, Parts of the Upper and Lower Jaw of the 

 Javan Loris (Stenops javanicus). 



(a) The front of the lower jaw seen from above. There 

 are six incisor teeth with two canines placed close to the 

 sides of the outer ones. 



(b) The front and canine teeth of the upper jaw. There 

 are only two incisors. 



Fig. 7. Skull of a Loris (Stenops potto). See figs. 6a and b. 



Fig. 8. Skull of a Gibbon, or Javan Ape (Hylobates leuciscus), 

 one-half size. — The orbits are large and are directed straight 

 forward. The canine teeth are large. The number and 

 arrangement of teeth is the same as that of man. The 

 forehead is low, and both jaws project (prognathous). The 

 posterior margin of the orbit is complete. 



