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Fic. 47-—Amphioxus danceolatus. (After Hackel) a, anus; az. eye; 4, ventral muscles; ¢, body-cavity; ch, 
notochord ; ¢@, intestine ; do and dz, dorsal and ventral walls of intestine ; 7 fin-seam; 2, skin; 4, gills; a, gill- 
artery ; /b, liver; a, liver-vein; m1, brain-bladder; m2, spinal marrow; mg, stomach; 0, mouth; 9, ventral 
pore; 7, dorsal muscle ; 5, tail-fin; 4, aorta; a, intestinal vein ; +, boundary between gill-intestine and stomach- 
intestine ; y, hypobranchial groove. 
