6 4 



MANUAL OF ZOOLOGY 



SECT. 



FIG 28. Various forms of epithelium, a, ciliated epithelium; , columnar; d, sur- 

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

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

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

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

 Lang's Comparative Anatomy.) 



