THE ALIMENTARY CANAL. 



79 



species. In Bees, the crop is called the "honey -bag." 

 The gizzard is found in Insects having mandibles, and is 



FIG. 41. Alimentary canal of a Beetle : 

 <i, pharynx; &, gullet, leading to crop, 

 ,-, gizzard, d, and stomach, e; /, deli- 

 cate urinary tubes ; g, intestine ; h, 

 other secreting organs. 



FIG. 42. Alimentary Canal of the Bee 

 (Apis mellifica) : a, gullet ; &, crop ; c, d, 

 stomach ; e, small intestine ; /, large in- 

 testine ; g, anal orifice ; h, urinary ves- 

 sels ; ?', auxiliary glands. 



frequently lined with rows of horny teeth, which are spe- 

 cially developed in Grasshoppers, Crickets, and Locusts. 

 The intestines are remarkable for their convolutions. In- 

 sects have no true liver ; but its functions are performed 

 by little cell-masses on the inside of the stomach. 39 



The alimentary canal of Spiders is short and straight, 

 the pharynx and gullet being very minute. The stomach 

 is characterized by sending out tubular prolongations, and 



n I' I" I'" s n n 



FIG 43. Anatomy of a Sphinx Moth: n, nervous cord ; n', brain sending off nerves 

 to the legs, I', I", I'", and for the wings at n" ; k, dorsal vessel, or heart ; c, crop; 

 , stomach ; i, intestines ; o, reproductive organs ; o', oviduct ; 8-20, segments. 



