6 4 



MANUAL OF ZOOLOGY 





Fig 28. — Various forms of epithelium a, ciliated epithelium; 3, columnar; rf, sur- 

 face view of the same, c, tessellated; e, the same from the surface; /, flagellate 

 epithelium with collars; g, flagellate epithelium without collars; k, epithelium 

 of intestine with pseudopodia; i, stratified epithelium; k, deric epithelium of a 

 marine planarian with pigment cells, rod cells, and sub-epithelial glands. (From 

 Lang's Comparative Anatomy.) 



