ANATOMY OF THE DANA IS BUTTERFLY 307 



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FIG. 311. Transverse section of the proventric- 

 ulus of Gryllus cinereuts : muc. muscular walls ; 

 r, horny ridge between the large teeth (*'). 

 After Minot. 



FIG. 310. 



FIR. 312. Transverse section of the pro- 

 ventriculus of the cockroach. After Miall and 

 Denny. 



FIG. 310. Anatomy of Danais archipjmn 

 after removal of right half of the body. Letter- 

 ing of the head: a. antenna; p/i, pharynx; 

 pi, labial palpi; r, proboscis; y, brain ; '*(/, 

 subo?sophageal ganglion. Lettering of the 

 thorax : I, II, III, thoracic segments ; ftj, b 2 , b 3 , 

 the coxal joints of the three pairs of legs : Inn , 

 muscles of the wings ; ac, cephalic aorta with 

 its swelling: IP, (esophagus; liij, thoracic gang- 

 lia of the ventral cord ; <*<?, salivary glands of 

 one side, those of the other side cut off near 

 their entrance into the common salivary duct. 

 Lettering (\fthe abdomen: 1-9, abdominal seg- 

 ments ; A, heart ; nm, so-called sucking-stomach 

 (food-reservoir); cm, chyle-stomach; ay, ab- 

 dominal ganglia; ed, hind intestine with colon 

 (c) and rectum (r) ; tim, urinary vessels ; on, 

 ovarial tubes, those of the right side cut off; 

 ove. terminal filaments of the ovaries ; be. bursa 

 copulatrix ; obc,, its outer aperture ; <>d , ovi- 

 duct ; vftff, vagina ; wo, its outer aperture ; 

 ad, glandular appendages of the vagina partly 

 cut away ; vtk, connective canal between the 

 vagina and bursa copulatrix with swelling (re- 

 ceptaculum seminis) ; an, anus. After Bur- 

 gess, from Lang. 



