( 337 ) 



TABLE XLII. 



Systematic Survey of those Primitive Organs which must probably be 

 regarded as homologous in Worms, Articulated Animals, Soft-bodied 

 Animals, and Vertebrates. 193 



Worms 

 ( Vermes). 



Articulated 

 Animals 



(Arthropoda). 



Soft-bodied 

 Animals 



(Mollusca). 



Vertebrates 

 ( Vcrtebrata). 



I. Products of the Differentiation of the Shin-sensory Layer. 



IV. Products of the Differentiation of the Intestinal- glandular Layer 



12. Intestinal epithe 

 hum 



12. Intestinal epithe- 

 lium 



12. Intestinal epithe- 

 lium 



12. Intestinal epithe- 

 lium 



