INSECTS. 



99 



IV 



FIG. in. Foot of house-fly, show- 

 ing the pads by which it clings. 



food passes by the oesopha- 

 gus, b, into a membranous 

 stomach called the crop, r, 

 and thence, in the biting in- 



FIG. 112. Longitudinal and verti- 

 cal section of a female cockroach 

 (Blatta}. 1 to XX, somite of 

 the body ; i to n, somite of 

 the abdomen ; A, antenna ; /, 

 labrum ; a, mouth ; 6, oesopha- 

 gus ; c, crop ; d, proventriculus, 

 or second stomach ; /*, intestine ; 

 z, rectum ; /, salivary gland ; k, 

 salivary receptacle. By an error, 

 the duct is made to terminate 

 above instead of beneath the 

 lingua. H, position of heart ; 

 m, cerebral ganglia ; N, thoracic 

 ganglia ; _/", chyle stomach. (Af- 

 ter Huxley.) 



