352 



THE ANATOMY OF INVERTEBRATED ANIMALS. 



Fig. 98. — Longitudinal and vertical section of a female Cockroach (Blatta).—\ to xx, 

 somites of the body; 1 to 11, somites of the abdomen ; A. antenna ; lb, labrum ; 

 a. mouth ; 6, oesophagus ; c, crop ; d, proventriculus ; e, pyloric caeca ; /. chylific 

 ventricle ; g, insertion of the Malpighian caeca ; h, intestine ; i, rectum ; v, vulva; 

 I, salivary L'land ; k, salivary receptacle. By an error, the duct is made to termi- 

 nate above instead of beneath the lingua. JI, position of heart ; m, cerebral gan- 

 glia ; ^, thoracic ganglia ; x, cerci. 



lingua, or hypopharynx,hehm&. The oesophagus, beginning 

 as a narrow tube, passes between the anterior crura of the 

 tentorium, and then, leaving the head by the occipital foramen 



Fig. 99.— Longitudinal and vertical section of the abdomen of a male Cockroach 

 (Blatta). — 1, 2. 3, 4, etc., terga and sterna of the abdomen ; t, mushroom-shaped 

 gland ; z>, aperture of the vas deferens ; A, anus. 



and traversing the neck and thorax, gradually widens into 

 the large crop or ingluvies (Fig. 98, c), which lies in the ab- 

 domen. This is followed by the small thick-walled proven- 

 triculus (Fig. 98, d), shaped like a pear, with its broad end 

 applied against the crop. The narrow end of the proventricu- 

 lus opens into a wide canal, the so-called chylific ventricle or 



