630 



ZOOLOGY. 



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

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

 sbarp-pointed scissors are useful, with a German silver blow-pi] e 

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

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

 strument's, 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. 



Tabtjla-B View of the Eight Classes of Vertebeates. 



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Sub-branch III.— CRANIOTA. 



1 



StTB-BRANCH 11. — ACRAOTA. I. Leptocaedii (Lancelet). 



SiTB-BBANCH I.— UROCHORDATA. I. TT:>ncATA. 



