The encyclopædia britannica; a dictionary of arts, sciences, literature and general information . continuous withthe exoskeleton. Thefore-gut is composed ofa tubular gullet, a largesac-like crop (fig. 12, c)and a proventriculus or gizzard, whose func-tion is to strain the food-substances before theypass on into the tubularstomach, which has nochitinous lining. Thisorgan, usually regarded asa mid-gut, gives off anu mber of secretory caecaltubes (fig. 12, coe). Atits hinder end it is con-tinuous with the hind-gut,which is usually differen-tiated into a tubular coiledintestine (fig. 12, i) and as
The encyclopædia britannica; a dictionary of arts, sciences, literature and general information . continuous withthe exoskeleton. Thefore-gut is composed ofa tubular gullet, a largesac-like crop (fig. 12, c)and a proventriculus or gizzard, whose func-tion is to strain the food-substances before theypass on into the tubularstomach, which has nochitinous lining. Thisorgan, usually regarded asa mid-gut, gives off anu mber of secretory caecaltubes (fig. 12, coe). Atits hinder end it is con-tinuous with the hind-gut,which is usually differen-tiated into a tubular coiledintestine (fig. 12, i) and aswollen rectum (fig. 12, r).From the fore-end of thehind-gut arise the slenderMalpighian tubes (fig. 12,k), which have a renal(unction. On either side of thegullet are from one toten pairs of salivaryglands (fig. 12, s) whoseducts open into themouth. Some of theseglands may be modifiedfor special purposes—assilk-producing glands incaterpillars or as poison-glands in blood-suckingflies and bugs. The foodpassing into the crop isthere acted on by thesaliva and also by anacid gastric juice which. c;a?
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectencyclo, bookyear1910
