630 



ZOOLOGY. 



of large subjects for better facility in dissecting. A small sharp- 

 pointed narrow-bladed scalpel, besides a large one, curved, as well as 

 sharp-pointed scissors are useful, with a German silver blow-pipe 

 for temporarily distending vessels ; and also a blunt-pointed copper 

 wire or probe made for surgeon's use, will be necessary. All these in- 

 struments, put up in a compact box, can be purchased at the surgical 

 instrument maker's, as well as syringes for injecting the circulatory 

 organs and vascular parts of the viscera. 



TABULAR VIEW OF THE SEVEN CLASSES OF VERTEBRATES. 



cS 



a 

 s 



cS 



S 



J 



a 



s 

 3 



S 



SUB-BRANCH II. CRANIOTA 



SUB-BRANCH I. ACRANIA. I. LEPTOCARDII (Lancelet). 



