
viii INTRODUCTION. 
_fhort intervals .). The.heart has one auricle and one 
ventricle. Their blood is cold and red. Their 
_jaw-bones lie one over the other. The eggs of — 
moft are covered with a fkin. They have a naked 
~ fxin-like covering. ‘They are called sabes or 
ee Animals, 
sR 1) @yeR OR CLASS 
Have external gills, The heart has one auricle and 
: one ventricle. ‘Fhe blood i is cold and red. ‘Their — 
"jaws levone over the other. Their eggs have no 
white. -‘They are without ears, They are ‘covered 
| with feales which lie one over another. They have 
fins for fwimming, and are called. Pifces, ot Pith, 
Fir tT Hee 408 
The heart has one auricle and one ventricle. They 
have a cold fanies inftead of blood. Have antenn, 
or a kind of horns; but no brains, ears, or noftrils. 
They breathe through vent-holes arranged along 
their fides. Their j jaws are placed crofs-wife, They 
‘grercotered with a kind of bony fkin. They are. > 
called lnfetta, or Infects. : 
Six fa cin Ae s ae 
: . T be heart has one auricle and one ventricle, They © 
have a cold fanies inftead of blood. Their breathing — 
) holes are ob{cure. The jaws are various, in various, 
_ kinds. Their fenfes conlitt i in their tentacula. They 
have no heads, ears, or noftrils, or fcarcely eyes: 
Sometimes 
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