Ill 



ZOOI.- 



resembles ours (Fig. SS). admitting that in some, as in the 

 whale, the number <>t' phalanges appears to exceed that of 

 niainiiials generally, and that the tinkers themselves seem to 

 he replaeed },y a Jiuiiiher of MMOCU pives. reunited under 

 a eomninn integument, as is seen in the tins of lishe>. 



Fig. 89. The Flying Fish (the Dactylopterus). 



294. The structure of the organs which enable an 

 animal to fly, has much analogy with the fins generally : 

 thus there are fishes (Fig. 89) 

 which use indifferently for pro- 

 gression in air or water their 

 pectoral fins. 



Some squirrels, and the animals 

 called ijaleopitheci. have a wide 

 expansion of the common integu- 

 ments extending on either side. 

 from the neck to the tail and 

 hinder extremities: and hy this 

 they can supjx>rt themselve- in 

 the air for a short time : it an>\ver> 

 in fact the purpose of a parachute. 

 In the vertebiata. the wings 

 are always formed hy the pec- 

 toral extremities, without re- 

 quiring on the part of the limh 

 any very extraordinary metamor- 

 phosis. ' The figure (Hi) repre- 

 senting the skeleton of the bat 

 explains this sufficiently; the pha- 

 langes of the fingers are much extended, and with them the 

 internments. 



The wings of birds, which at tir>t si^ht seem to differ 



Fig. 90. Galeopithecus. 



