STEUCTUEE OF GLANDS. 



251 



obvious purpose of saving room ; in other instances, still, the 

 organ presents itself in the shape of one or more club-like 

 canals nearly straight (5), or bent at an angle with corn- 



Fig. 253. 



3. 



4. 



5. 



1. Testis of Julus. 



2. Tipula crocata. 



3. Ranatra linearis. 



4. Harpalus ruficornis. 



5. Cercopis spumaria. 



mencing divisions at the end, or with the end forming a 

 rounded vesicle ; or otherwise two coecal canals are connected 

 like hooks, or they are finger-shaped, or form tufts of dif- 

 ferent kinds quiver-like, star-shaped (6), or like the flowers 

 of syngenesious plants (7), or they form small saccules in the 

 shape of pannicles (8), or they are clustered like grapes or 

 berries, and attached to styles (9). In this way do the forms 

 of this gland alter in nearly allied species in the insect world, 



