AN INTRODUCTION TO THE VERTEBRATES 



243 





Fig. 140. — Various kinds of cells. 



A, female germ cell, ovum of a cat; B, male germ cell, spermatozoon of a 

 snake; C, ciliated epithelium; D, cartilage; E, striated muscle fiber; F, 

 smooth muscle fibers ; G, a nerve cell from the cerebellum of man. (From 

 Dahlgren and Kepner.) 



