. Catalogue of the Chaetopoda in the British Museum (Natural History). Oligochaeta; Polychaeta. Gills of Arenicola 61 cristata, both of which have eleven pairs of gills, are the extreme terms in the gill-series: in the former the axes are reduced and the branches clustered, in the latter the axes are elongate, and have numerous pinnately arranged branches. The gills of the two ecaudate species, A. rcaiulala and hranchialis, which are identical in form, differ markedly from those of the caudate species. One of the smaller gills of a Neapolitan example of A. hranchialis (70 mm. long) is shown in
. Catalogue of the Chaetopoda in the British Museum (Natural History). Oligochaeta; Polychaeta. Gills of Arenicola 61 cristata, both of which have eleven pairs of gills, are the extreme terms in the gill-series: in the former the axes are reduced and the branches clustered, in the latter the axes are elongate, and have numerous pinnately arranged branches. The gills of the two ecaudate species, A. rcaiulala and hranchialis, which are identical in form, differ markedly from those of the caudate species. One of the smaller gills of a Neapolitan example of A. hranchialis (70 mm. long) is shown in Fig. 35. Arising from a short common trunk are three stems about 1 mm. long, each bearing three branches, which are given off on one side only. The sub- divisions of these branches are similarly restricted to one side, and the division is invariably dichotomous. The larger gills of the same. 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 Ashworth, James Hartley, 1874-1936; Ashworth, James Hartley. London, Printed by Order of the Trustees of the British Museum
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Keywords: ., bookcentury1900, bookdecade1910, bookpublisherlondo, bookyear1912
