■20-2 CHOKUATA 



these differences in mind we sliall liriefly discuss one cla.se 

 of the Clioreiata antl then pass to tlie better-lvnown verte- 

 brates. 



CLASSIFICATION OF THE CHOKDATA 



Bhanch XII — Cliordata. 



Sub-branch — L'rochorda. 



Class — Urochorda or Tunicata. 

 Order — Asfidiacea. 

 Type of Order. 



Ascidia species — Sea sijuirt. 

 Sub-branch — \'crtebrata. 

 Division A — Acrania. 

 Class — Aeraida. 

 Type of Class. 



Awphin.rus hiiicrolatus — Lancelet. 

 Division B — Cmnintn. 



Class I — Cyclostomata. 

 Type of Class, 



Petrnmyzon marinus — Lamprey. 

 Class II — Pisces. 

 Type of Class. 



Pcrea flnvescens — Perch. 

 Class III — Amphibia. 

 Type of Class. 



Bufo Icntiginosiis — Toad. 

 Class JV ~ Reptilia. 

 Tyjie of (dass. 



Crolalus horriilns — Rattlesnake. 

 ('lass r — Aves. 

 'type of Class. 



Passer doinestieiis — Sparrow. 

 Class r/ — Mammalia. 

 Tyjjc of Class. 



Lcpus sylvatieus — l\,abf)it. 



