552 



THE ANATOMY OF INVERTEBKATED ANIMALS. 



Fio. 93. — ^Loni?itndinal and vertical eection of a female Cockroach (Blatta).~i to XX^ 

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

 a. mouth ; 6, cesopbaguB ; c, crop ; rf, proveotricnius ; e, pyloric caeca ; /, chylific 

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

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

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

 glia ; iV^, thoracic ganglia ; x, ccrci. 



lingua, or h7/pophar^nx,he\i\vA. The oesophagus, beginning 

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

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



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

 {Titafta). — 1, 2, 3, 4, etc., ter^a 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, c?), 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 



