. A text-book of invertebrate morphology. Invertebrates. TYPE EOHINODEBMA. 675 cate canals. These organs, which, are usually quite small, are situated in the yicinity of the ambulacral pores or near the mouth, and are supposed to haye a sensory, perhaps olfactory, function. Owing to the presence of the firm test the muscular system pp an tt. Fig. —Diagkam showing the Structure of an Eohinoid Al = Aristotle's lantern. nr = epithelial nerve-ring. amp = ampulla. oc = ocular plate. an = aboral nerve-ring. og — ovoid gland. as = axial sinus. pa = perianal space. au = auricula. pp = periproctal
. A text-book of invertebrate morphology. Invertebrates. TYPE EOHINODEBMA. 675 cate canals. These organs, which, are usually quite small, are situated in the yicinity of the ambulacral pores or near the mouth, and are supposed to haye a sensory, perhaps olfactory, function. Owing to the presence of the firm test the muscular system pp an tt. Fig. —Diagkam showing the Structure of an Eohinoid Al = Aristotle's lantern. nr = epithelial nerve-ring. amp = ampulla. oc = ocular plate. an = aboral nerve-ring. og — ovoid gland. as = axial sinus. pa = perianal space. au = auricula. pp = periproctal space. br = external branchia. pph — peripharyngeal space. Go = ccElom, pv = Polian vesicle. G = reproductive organ. R = rectum. Od = genital duct. rh = radial hydioccel-vesse Op = genital pore. rn = radial nerve. Or = genital rachis. so = stone-canal. ?ir = hydrocoel-ring. si = siphon. 1 = oesophagus. sp = spine. Ir = lacunar ring. tf = tube-foot. M = raadreporite. it = terminal tentacle. is but feebly developed, being represented by the muscles attached to the spines, pedicellarise, etc., and by those which move the parts of the masticatory apparatus when it is present. The coelom (Fig. 265, Co) is comparatively spacious, though. 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 McMurrich, J. Playfair (James Playfair), 1859-1939. New York, H. Holt and Company
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishernewyo, bookyear1894
