10 MORE MINOR HORRORS 



verting starch into the more soluble sugar. 



1^:33 



Fig. 4. — A female cockroach, Periplaneta, with the dorsal exo- 

 skeleton removed, dissected to show the viscera. Magnified about 2. 

 1, Head ; 2, labrum ; 3, antenna, cut short ; 4, eye ; 5, crop ; 6, 

 nervous system of crop ; 7, gizzard ; 8, hepatic caeca ; 9, mid-gut or 

 mesenteron ; 10, Malpighian tubules ; 11, colon ; 12, rectum ; 13, 

 salivary glands ; 14, salivary receptacle ; 15, brain ; 16, ventral 

 nerve cord with ganglia; 17, ovary; 18, spermatheca ; 19, oviduct; 

 20, genital pouch, in which the egg-cocoon is found ; 21, coUeterial 

 glands ; 22, anal cercus. (Prom Latter.) 



The food is further ground up by a series 

 of hard ridges projecting into the inner face 

 of the gizzard (Fig. 4, 7). The secretion 

 of the so-called hepatic caeca is capable of 



