. A textbook of invertebrate morphology [microform]. Invertebrates; Morphology (Animals); Invertébrés; Morphologie (Animaux). TYPE CRUSTACEA. 877 tremity encroaching but slightly upon the thorax (Isopoda) It IS provitied with a varying number of openings alon/^ its sides, through which the blood gains entrance to its cavity from the pericardial sinus—the«e openings, termed ostia being guarded by valves opening inwards 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 wid
. A textbook of invertebrate morphology [microform]. Invertebrates; Morphology (Animals); Invertébrés; Morphologie (Animaux). TYPE CRUSTACEA. 877 tremity encroaching but slightly upon the thorax (Isopoda) It IS provitied with a varying number of openings alon/^ its sides, through which the blood gains entrance to its cavity from the pericardial sinus—the«e openings, termed ostia being guarded by valves opening inwards 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. an Fig. of Structure op Crustackan {Cambariuls an = anus ca = carupiice. ee = cerebral guugliou. h = heart. i = intestine. I = digestive gland. m = mouth. mp = opening of vas deferens. ne = nephridium. s = stomach. sa = sternal artey. te = testis. tl = telsou. vd = vas deferens, vn = ventral nerve. 1-6 = abdominal segments. body, and thence is distributed to the branchi*, passing from them back to the pericardial sinus, and so to the heart a.^ain The blood IS usually colorless, tliough occasionally greenish, m which case it contains a respiratory copper-containing pig! nient termed hsemocyanin, or reddish, in which case the pig- went is haemoglobin. It consists of a plasma in which float aiiKeboid nucleated corpuscles. The digestive system consists of an almost straight tube extending from mouth (Fig. 168, m) to anus (an) and divisible luto three regions. The mouth is bounded in front by an overhanging lip, and behind by a lower lip which arises as two separate parts, which by some writers have been regarded i '^. 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 original
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishernewyo, bookyear1896
