30 



TNTE OB UCTION. 



ovaU;^^, 



*-, caput, 

 ' ~ {kto-d] 



arm 



Simstrai 



/ ..-'Cauda (ta'dj 

 Fi^.3. Dorsal aspect 



axon 



sinistra I 



neuron 



dtxirai 



-—enteron 



jTM em 6 rum) 



Fiq. 3. TfamectLon 



p- 



■^ ^i^'ijN ^ventral 



■^>y ^'^•■^ H^misection 



DiAGKAMs OP Three Aspects of a Vbbtebeatb, 



EXHIBITINO THE MOST GENERAL FEATURES. 



