378 SYSTEMATIC ZOOLOGY. 



peculiarities of structure. To the fruit-eating species 

 belong the large bats of the East Indies known as flying 

 foxes. All of our bats are insect-eating. Some of the 

 South American bats (not the one called the vampyre by 

 Linne) are- known to suck the blood of other mammals. 



In the five orders Marsupials, Edentates, Rodents, In- 

 sectivores, and Bats the surface of the cerebrum is smooth; 

 in all the remaining orders it is at least fissured, and in 

 most it is convoluted (see fig. 157), this increase in sur- 

 face reaching its greatest development in man. Since 

 this line of division corresponds in a way with the intelli- 

 gence of the forms (see p. 366), the five orders already 

 mentioned are grouped together as Ineducabilia ; the 

 others- are associated as Educabilia. 



ORDER V. CETACEA (Whales). 



The whales have a fish-like body, the resemblance being 

 frequently heightened by the development of a dorsal fin; 

 and yet in all points of structure they are mammals. The 



FIG. 166. Pigmy whale (Kogia floweri). From Gill. 



anterior limbs contain the same bones (except that the 

 number of joints in the fingers may be increased) as do 

 our own, but the whole has been modified into a * flipper' 

 for use in swimming. The hind limbs are absent exter- 

 nally, but imbedded in the flesh on either side is a bone, 



