1.K.CTURE IV. 141 



Iliick fins uhile the tail, \\liicli is divide.! into two 



\\ muscular and i. n- 



dinons, hc:< I of any IMMU-S analogous to 



the f ; -(t in i' Mammalia; th<>>,- hones 



'nnil in tin- fins or fore-feet. 



1 appearance of tin (' ' < eons 



lia or Wli.. much resembles that of 



a li>h. that it is vt ry natural for anyone to sup- 



that they should be classed ainon^ that trilio 



iiimals, and not with tlu- rest of th(> Main- 



jnali.' ; and indeed so far has this eompliance with 



popular ci!>tom Tolloucd, that most natu- 



ralists, till the institution of the LinnaMii S\>j< m, 



them the appellation of Fi-hcs. Tims, ex- 



rln-ivr of the more early writers, the eeh-hr, 



.uul Willoughby considered them in this view, 

 and rommeneed their History of Fishes with that 

 of Whales. Nay i veil Limr.vu - him- If, in his 

 well-known work the Fauna Su as well as in 



some of tin- earlier editions of the Svst< -ma Xa- 







turze, at them under the class of IV 



Hut, sine.- their whole interior structure a^: 

 with that of the Mannn.iiia; since they have lr 

 and l>nathc, MIX tin \ h;;\e \\aim blood, and a 

 heart ic-< uibling in conformation that of Qua- 



