460 



ZOOLOGY 



The Earthworm is devoid of organs of sight or hearing. It 

 exhibits sensitiveness to bright light, the sensitive elements being 

 large cells of the epidermis devoid of pigment. The sense of 



Fig. 3H-2. — Nephridium of liUmbricus (diagrammatic). — a. ampulla Ijttwcun ciliated and non- 

 ciliated parts of the intracellular canal ; i:U. ciliated part of tlic intracellular canal ; coe. 

 investment derived from the coelomic epitlicliuni ; u-t. nephridioporc ; t.c. non-ciliated part 

 of the intracellular canal ; mes. septum ; I'st. ncphrostome ; t.v. intercellular canal of the 

 tcrnrilnal vesicle. /. — 111. the three principal loops. (From Meisenhcimer, after Maziarski. ) 



hearing appears to be absent ; but a faculty analogous to taste 

 or smell, enabling the animal to distinguish between different 

 kinds of food, is well developed. The goblet-shaped bodies, groups of 



