. A textbook of invertebrate morphology [microform]. Invertebrates; Morphology (Animals); Invertébrés; Morphologie (Animaux). TYPE CRUSTACEA. 377 tremity encroacliiug but slightly upou the thorax (iHopoda). It is provided with a vai'yiufj; number of opeuiugs along its sides, through which the blood gains entrance to its cavity from the pericardial sinus—these openings, termed otitioy being guarded by valves opening iu wards and preventing regurgitation of the blood during systole. From either end of the heart arteries arise which, after a longer or shorter course and many or few branchings, op
. A textbook of invertebrate morphology [microform]. Invertebrates; Morphology (Animals); Invertébrés; Morphologie (Animaux). TYPE CRUSTACEA. 377 tremity encroacliiug but slightly upou the thorax (iHopoda). It is provided with a vai'yiufj; number of opeuiugs along its sides, through which the blood gains entrance to its cavity from the pericardial sinus—these openings, termed otitioy being guarded by valves opening iu wards and preventing regurgitation of the blood during systole. From either end of the heart arteries arise which, after a longer or shorter course and many or few branchings, open widely into the lacunar spaces. From these the blood passes in some forms into a venous sinus situated on the ventral surface of the. Hd vn Pig. 168.—Diagram of Structurb of Crustacean (Oambanu). an = unus. ea = carupuce. ee = ctiiebrul guogliou. h = heart. 1 = iutesliue. I = digestive glaud. m — luoutb. mp = opeuing uf vas deferena. ne = nephridium. 8 = stomach. 9a = sternal artery. te = testis. tl = telson. vd = viis deferens. vn = ventral uerve. 1-6 = ubdoiuiual segments. body, and thence is distributed to the branchiae, passing from them back to the pericardial sinus, and so to the heart again. The blood is usually colorless, though occasionally greenish, in which case it contains a respiratory copper-containing pig- ment termed hsBmocyanin, or reddish, in which case the pig- ment is hasmoglobin. It consists of a plasma in which float amoeboid nucleated corpuscles. The digestive system consists of an almost straight tube extending from mouth (Fig. 168, m) to anus (an) and divisible into three re:'ions. The mouth is bounded in front ^^y an overhanging lip, and behind by a lower lip which arises as two separate parts, which by some writers have been regarded. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the orig
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishernewyo, bookyear1894
