. Elementary text-book of zoology [electronic resource]. Zoology. ARENICOLA. 187 It should be noticed (i) that the hearts are paired, two- chambered, and independent in action; (2) that the hearts are not on the main outer circle formed by the dorsal and ventral vessels, but merely force blood into this current; (3) that the hearts pump blood to the gills and the body, and hence they are not definitely either respiratory or systemic. Y\g. \\\\Y^N OF Neryk-ring and Mouth Re(jion OF Arenicola. (After AsHWOKTH and Gamble.). Note the OEsophagus cut across leaving a hole round which the nerve-r
. Elementary text-book of zoology [electronic resource]. Zoology. ARENICOLA. 187 It should be noticed (i) that the hearts are paired, two- chambered, and independent in action; (2) that the hearts are not on the main outer circle formed by the dorsal and ventral vessels, but merely force blood into this current; (3) that the hearts pump blood to the gills and the body, and hence they are not definitely either respiratory or systemic. Y\g. \\\\Y^N OF Neryk-ring and Mouth Re(jion OF Arenicola. (After AsHWOKTH and Gamble.). Note the OEsophagus cut across leaving a hole round which the nerve-ring passes and joins behind to form the ventral nerve-cord. The nervous system in Arenicola consists of a paired brain in the prostomium, a ring round the pharynx in the Nervous peristomium and a ventral nerve cord running in the median ventral wall of the body. There are no ganglia, Arenicola has no eyes but is endowed with. 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 Masterman, Arthur Thomas; Parsons, John Herbert, Sir, 1868-1957, donor; S. H. Lazarus (Firm); University College, London. Library Services. Edinburgh : E. & S. Livingstone
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectzoology, bookyear1901
