Subkingdom VIII. Vertebrata.— Internal skeleton; notochord or back-bone ; nervous cord dorsal 
and separated from body cavity; circulation complete; limbs not more than four. 
Division I. Uroehordata. 
Class I. Tunicata.—-Notochord temporary ; body usually covered with a sac containing cellulose : Ascidia. 
ARRANGEMENT OF REPRESENTATIVE FORMS. 
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Order 2. Uuodela.—T ailed; gills usually temporary: Salamandra. 
Orders. C^eoima.—S nake-like; no limbs: Ccecilia. 
Orders. Anura.—T ailless; gills temporary; { D ° tee ^ • £> u f°- 
* (upper teeth only: Rana. 
