352 



THE ANATOMY OF INVERTEBRATED ANIMALS. 



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

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

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

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

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

 nate above instead of beneath the lingua. H, position of heart ; ?n, cerebral gan- 

 glia ; iV, thoracic ganglia ; x, cerci. 



lingua, or hypopharynx, behind. 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). — i, 2, 3, 4, etc., terga and sterna of the abdomen ; t, mushroom-shaped 

 gland ; v, 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 



