338 MAMMALS 



hifj,i]ly developed eyes, yi't tliey are so adapted to nocturnal 

 Hij^ht, Ix'cause of the ^leat (le\'elopment of the tactual sense 

 in the winji; nienihranes, that they easily avoid the objects 

 in or near their path. Indeed, it is said, they could do this 

 were the>- totall}' liliiid. A^ain, in iiKjst maninials, we find 

 the hind pair of le.^s the si ron,;;!']- ; but in tlie bats, the front 

 pair is the stronj^ei- and better de\'elo])ed, which is a direct 

 ada]:)tation for fli.nht, since it is these that are mainly con- 

 cerned in fiiglit. 



Instances of adai)tations among the mammals are almost 

 without end, and our space forbiils mention of more. 

 Much pleasui'e and profit ma\' be derived from a study of 

 the habits of mammals and of the adaptations to meet the 

 demands of their environments. 



CLASSIFICATION OF THE EX.VMPLES 



Class — Muiiiinali:i. 



Subclass I — Protothfria. 



Order — .\[(jn(iti'emata. 

 Types 111' < )i-(lcr. 



Oniillinrhiiiich KS nnntiiius — Ducldoill. 

 Tarhi/f/tiissiix (icii/ialtis or Ecliiilna aculeala 

 — Spiny ant-eater. 

 Sttbdnss II — Tfieria. 



Secliiiii A — Mi'latlieria or Marsupialia. 

 Onlei- — I'iifv|ini1(i(l(intia. 

 ^J'yp(! of ( )i'(lei'. 



Dnlrljihiis finjiniiiiia — Opossum. 

 r)r(ler — I)i]ii-()toil(intia. 

 Ty|>e of ( )r(ler. 



Miiniipiis fjiijantciis — Kangaroo. 

 Section [I — Ivitlieiia. 

 OrdiT - tlilenlat.-i. 

 Types of C)t'(ler. 



